We’ve never had problems with building in the past if you’ve played on 1 decent server.
On officials in the past you can stay on the server with 800-900 “red” ping
Now Battleye kick you out of server then you have ping spikes.
And since you say:
In the past we could barricade in the caves like “Crevice”
with 70 base layers on each side.
Same for Gutter tunnel.
Make pillar bases with claim around it.
And now with the new rules that came with 3.0 they punish for that.
All reports with proof “screens and videos” are treated individually if you are in the rules you have nothing to reproach yourself for. If you think you are alone on the server and can do what you want, this is your problem.