Obvious botting for community squatting is an issue to address without question, and if possible that user needs to be shut off, but limiting a real person's decision and willingness to put effort into modding several communities will not be an answer when the question isn't the right one. Bots/squatters can register accounts all day and work around a subcom mod limit with ease. All the proposal on this post does is punish people willing to do leg work on multiple subs without having a real effect on nefarious mod squatting activity.

Ultimately, it would be useful to have multi-community bots that are used to help human mods in the same way it was done on reddit. It is still something we can address as an individual bot/squatter issue rather demand blanket bans that treat it as systemic.

As far as solutions, I think perhaps creating a publicly organized council of public and known admins/mods/users to curate reports and assist with cleanup of this sort of clusterfuck from botters may be the only solution that can be well received if all the work is done in the open.