Whilst it doesn't support ActivityPub, I do want to eventually look into that. In fact, initially it was going to be part of the MVP, until I realised it was going to take me too long to make it work, so I opt'ed to de-prioritise it for now.

I don't see anything in OP's post nor the linked "why I built it" that would suggest ActivityPub or federation. What are you seeing that suggests that these terms are missing?