You can do absolutely anything on it. Modded client, x-raying, item duplication. There are no area protections. PvP enabled.
It is difficult to leave spawn :)
Egregious bugs like item dupes are also patched; but while they last, they're allowed.
I know 2b2t is old enough to have had many different eras, but when I heard about and checked it out in 2018, the spawn was barren, of course, but I had no problem leaving and surviving out to a pretty far distance to build a little base.
As long as that anything doesn't consist of putting anything bad in chat or a sign such as a cuss word like "shit" or building a build or map art that someone may find offensive.
If you want to do absolutely anything you need to find a different server.
There are other servers who are small enough to continue to have actually anarchy and who are willing to require having alternate domains to bypass the blocks.
Here's another server saying the same thing happened to them: https://minecraftonline.com/wiki/Mojang_Blacklist_Timeline
Here's a mainstream source, though it doesn't have any new information: https://www.msn.com/en-us/entertainment/gaming/15-years-late...
Do you have a grudge against housemaster?