The thing where it reinvites old accounts is a recent bit of well-meant stupidity from LJ. If anyone was ever made a maintainer of a community, then they can only be removed from that position by themself, or by the official owner of the comm -- even if they've been removed from membership in the comm. So every time anyone new gets invited, LJ also reinvites every maintainer who's no longer a member but didn't uncheck their own maintainership status before they got removed. The spamming of old admin journals from the official comms when we added new characters this time was a joy to behold.

The only solution seems to be for the spam-ees to re-join the community temporarily with those journals and remove their own maintainership status.