Thank you for posting about this topic. You are right that FR could be the target of such attacks.
We’ve already had some paid trolls who were subtle enough to survive here for the probable terms of their contracts.
Many groups including those supported by Arab oil money could overwhelm this site for while but hopefully Jim and company have plans for dealing with that sort of attack involving manpower and not cyber worming.
Perhaps set up a flag for a surge in sign-ups, then ditch them.