"If the community gets "0 weight," who gets 100%?"
veteran core contributors that they hold in high esteem because of all the years of saying smart shit and doing the work.
but this is a form of social capital someone compromised by say a intelligence agency would lose very quickly. while they could hang on to it among the general population longer, the core contributors would mentally decimate their weight immediately if they saw any sign of compromise. it wouldn't matter if a million twitter personas agreed with the rogue core dev.
so as you can see the system has it's uses. but it naturally perceives review bombing PRs as a sybil attack and is extremely resistant to it.