1) 'If you build it, they will come'... actually, no they won't. A forum without content is the Hannibal Lector of forum killers.
2) Abandonment problems. When a forum's owner and staff leave the building for whatever reason it's inevitable that the forum will die i.e. vbulletin.org.
3) The God complex (for want of a better term). When the forum owner, usually a narcissist, displays inflated feelings of personal ability, privilege or infallibility, typically this person will have no staff and periodically wipe their forum's content.
It is possible to resolve for example the lack of threads by hiring article writers and thread creators and paying them rewards for their work. For example, if you fail due to time then sell your website to another person. This is point one.
Second rules are not strict are favor. Many people may leave a community if rules are multiple and strict and then forums where rules are not strict gain in terms of joining and activity means the reverse thing will happen.
Third it is possible to switch to another server provider if server crash means you are not for example obliged to stay with same server provider this is third thing.
I mean that's a pretty unfair response, IMO at least. One person alone has little, if anything, to do with the current inactivity of FP. If anyone would've been responsible for killing FP with their decision making, the previous two owners of FP would've killed the forum long ago to a point where you wouldn't even know what it is now.
To get back on topic - three things to kill a forum (I'll talk about one): Lack of community engagement. You have to run consistent contests, welcome members actively, and find ways to make a real connection with your member base. A forum will probably never be as active as a FB group or Twitter (X), and you have to do something to make your memberbase feel like your forum is more beneficial to them than using one of those platforms.
Toxicity in the community is always the number one factor that will kill a forum every single time. It's important to weed out toxicity in the community before it becomes a widespread issue.
1) Ownership changes (usually when a forum is sold, there is a mass exodus. This forum seems to be immune from that for the most part but I've seen it many times elsewhere)
2) Lots of downtime and slow loading pages. Members will eventually stop trying if these issues persist.
3) Over-moderation ....and under-moderation. There needs to be a balance.
Toxicity in the community is always the number one factor that will kill a forum every single time. It's important to weed out toxicity in the community before it becomes a widespread issue.
We may leave a community because or due to the toxicity of some members or the environment is changed for us so this remains for example a good reason to leave it.
1. Poor management from the owner.
2. Toxi staff members who can't be objective.
3. No regard for your forum members.
When the owner is lacking in management role, his staff members can't get it right with him by putting him on the right track, the members will be stepped on. Once that happens, they are all going to leave permanently.
I would also say that absence of rules, improper moderation, and the inability of the forum to adapt to the evolving requirements of users. They will bore the users surely.
I would say a ghost town of a forum. If there's no members, you're just shouting in to the Void. It's no fun, and why would anybody join the Void only to be shouted at anyway?
Vacant staff. I mean, when even the Administrator isn't seen for days at a time, why should a member continue to stick around? There was a magical girl forum I thought would have been a decent place to hang out on, but like, there's only one person there, and he's posting nothing besides his fan-fictions. I tried to start and restart some conversations, but, I guess, see point One.
Too many rules, overly being strict, over moderation... this causes a suffocating experience. Nobody enjoys walking on egg shells, and with so many other places available on the Net, people will move on. In fact, people, like everything else in nature typically follow the path of least resistance.
Too many advertisements (I know this is only supposed to be three), but over monetization can really kill anything. Including hobbies, if you allow it.
There are a lot of things that can bring a forum to its knees.
The first one is an admin who abuses power because he has the tools to do so. As an admin, always remember that there are rules guiding your forum and if a member hasn't broken any of them, you have no right to ban them or restrict their activities on the forum.
The second one is political talks. I've seen forums where political arguments messed up everything. So, forum owners should be mindful of the type of political discussions that they allow to go on in their forum.
The last, but not the least is an inactive admin. When an admin is inactive, there is a chance that the forum will die a natural death when the community managers lack the drive to keep pushing out conversations.
Spam sign ups with the lack of action from admins/mods. My forum was attacked hard by spam a few weeks ago, and I had to turn on manual approval for new members.
1. Spambots, as they're the thing that killed my motivation to run forums
2. Lack of fresh content
3. Mass content deletion - bad actors attacking the website, server issues, etc
