It may be a similar issue to what was discussed in this thread.

I think at the time Fanaticus was flagged as suspicious because of its bot traffic, but headie_sage was able to sort that out. I wonder if the explosion of traffic yesterday tripped some spam detector on lemmy.world or if it’s just lemmy.world instability

EDIT: I think it’s the latter. I can’t see this thread but I can see all the other comments on a third party (feddit.uk)