I think it will be less of a problem then for example on twitter , because you can just mute/block/defederate instances that aren't able to control the spam on

I think it will be less of a problem then for example on twitter , because you can just mute/block/defederate instances that aren't able to control the spam on their instance. There is an incentive to stay small enough so that the mod team can keep up with the amount of work required to keep the community relatively spam free. Unlike twitter there aren't investors that want to keep growing endlessly so the hard problem of moderation at scale can just be sidestepped by the admin by closing instance signups once they reach moderation capacity.