I'll share my experience on the server. I have played there for probably hundred of hours, first on the vanilla server and recently on the new "HC" server. I've been playing in USG for around 2 years.
TLDR: If you like PVP, go somewhere else.
If you like survival, you better off in sandbox as no one will erase your progression on a bad day.
I'm lucky to have lot of game time, and I've recently put dedication into HC server building up a very strong base, gather vehicules, get my stats, and raid the few people playing the server while respecting the rules.
One of the rules on the server is to avoid destroying unnecessary stuff while raiding, I've always been very kind to other players, as they have no clue what would have happened to them on an official servers in same circumstances.
I then had some friends joining me.
We farmed alot and then decided to raid the "biggest" base on the server after ours.
Unlucky for us, it was some people for who rules don't apply same as us.
When said people breached in my garage and destroyed all my vehicules (not trying to steal it, just burn it down) it was fine, and they didn't even get a warning for it (I asked for proofs many times)
Then, when we raided them and my team mates destroyed 2 boxes, he get insta banned.
I opened ticket to asked for details, admin tell me he warned him multiple times. I asked to see said warnings.
The warning was a message in local chat while my friend was 5sec away to destroy a box, saying "if you destroy that you will be banned".
That's the kind of warning you get on USG before an insta ban. No talking, no warning kick, just erasing your progression instantly.
After more talking, admin understood I was shocked by his decision and that I'm not willing to play here anymore. I had planned to give my base to one of the moderator of the server who got very unlucky crossing my path abit too much.
I then got banned on the server, reason being "don't want to play here".