Whether ORP makes Alpha invincible or not is irrelevant. If you can't face a large tribe online while everyone is fighting then. You shouldn't be doing it. Offline raiding is a cowards act.
Spamming Pillars and foundations should be an offence punishable by devwipe. And in the case where the devs don't wipe it unused foundations and pillars should have a demolish timer that is based off of something other than members being off line. Foundation spamming is an issue even on official servers without ORP so ORP is hardly tbr issue when It comes to foundation and pillar spamming.