They do not. Or to be exact, there are rules but only for a few select offenses, blocking off the obelisks (unfortunately) isn’t counted as an offense.
Your best bet is finding a better server, whether private or official is up to you. There’s good ones and bad ones of either kind. Personally, the “petty kings” you often find on private servers sooner or later isn’t for me, but there are some for whom it’s the best way to play.
Thankfully on my (official PvE) server we have a community of mature* players who support each other in making sure “public infrastructure” is protected, despite repeated attempts to troll it in the past. Big shout out to Hal for his tireless work in that regard of course .
*don’t get a big head guys and girls, you’re all mental!