I will be honest, I can't say I have seen many VB forums since I came back to forums in October 2022. Most of what I see now has been running on Xenforo with a few on Woltlab and some on MyBB and phpBB as well.
It's a shame to see that vBulletin is now used as much anymore. It was such a great forum software back in the day.
I don't think many are running vB anymore and the ones that still do probably are running older versions since I've heard many complaints about vB5. Most communities that used vB back in the day made the switch to Xenforo I've noticed which isn't surprising. Most of vB's old devs moved on to Xenforo, and it's just a better software.