Oh boy here we go again…
In that case we need 2 types of PVP servers
1 - PVP Lawless - just like rust no rules and timers, free for all
2 - PVP Lawfull - you can attack any1 any time, but you can raid only bases currently online, quitting wont help, raid receive 1 hour window after logging out, so defend your base, or loose.
In 1st case we got deathmatch type of server for hardcore fun (no safe heaven)
In 2nd - more fair play, when people get chances to defend themselves from offline raiding.