Any one of a number of reasons:
- Obvious trolling,
- The topic isn’t something appropriate for these forums in the 1st place,
- Someone got personal,
- Too much “fighting” (bickering),
- It had run it’s course and was devolving rapidly,
- etc.
When one or more of those things happen the mods just lock the thread! If it’s too egregious they suspend the people for a week or so.
The mods here are EXCELLENT!!! Their approach to moderating these forms is the best I’ve seen in any public or private forum. An I’ve been the admin of a few and a mod on some truly huge ones in the CG industry - these people ROCK! in my opinion!
If this is the thread you’re talking about, it is still there - and likely will be for a very very long time.