Isn't ActivityPub extremely network intensive though? If all you wanted was a single user subscribing to a handful of communities then Lemmy would be inexpensive but to pull from a lot of communities I thought people have said that it can cost a bit of money, time, etc. Also defending against attacks such as CSAM.

Maybe make a distinction then between running a "tiny personal instance with only a few niche community subscriptions" vs. a small instance, either with multiple users or even just one person subscribing to many communities, if that cost would start to become more prohibitive?