I agree to not remove offline raiding in PVP servers.
And in addition to my comment above, the game only cost 13 EUR actually. So for a solo player, buy 2 times the game on 2 steam accounts and never be raided anymore!
Account 1 build main base in T1 only, never online during raid time. Never be raided.
Account 2 online during raid time, no base, raid, farm, etc… put everything in many hidden chests or bodyvault, get back everything with account 1 after raid time .