And then we will get more communities being created on Lemmy world, and then the whole Fediverse depends on one single instance. This seems like a good idea at first, but won't stand the test of time.
I am trying to convince more instance admins to install Fediverser on their servers, so that we can have a way to point people to one site that can distribute the users and help with onboarding and discovery. But so far none of the admins really seem to be interested in the having to deal with the potential influx of users from Reddit.
Criminals use stolen credit cards for high value items that can be sold quickly. If criminals really wanted to do mass manipulation via AP servers, it will be easier/faster/cheaper for them to spin up their own servers than signing up for paid accounts.
The one counter-argument that I would accept though: what if bad actors running psyops become commercial providers to attract legit customers and mix it with their agents?