One thing I've noticed that I feel might become an issue eventually is that occasionally someone will have something they really want to be seen, so they sort of cross-post it to every related community in every instance they can all at the same time, so it shows up in your feed a dozen times from a dozen different places and it takes sometimes a day or more to get fully pushed out of the way.

I've only seen it happen a few times so far so it's not currently a major issue, but I can definitely see the potential for abuse there. As more people join you'll inevitably start to get more of the marketers and influencers and eventually corporations showing up, and they tend to bring all their bots and tools and various ways of gaming the system so it'd suck if the whole feed ends up being just the same 3-4 things posted into dozens of places for the whole day.

I'm sure there are ways to filter those sorts of things out, but I think the challenge is going to be to find a way to keep it under control without putting too much on the user, so they don't have to be constantly tweaking their settings and blocklists, and so that new users who just browse without having an account yet don't just see an unappealing wall of nonsense.

Hopefully that doesn't end up being the case, but that seems to be the way it trends when you add more people in my experience.