I remember this being a kinda niche alternative to activity pub, and I always liked it because it had the ability to be local and P2P, with federated instances really just being repeaters. I didn’t like that it was immutable, but that was just the cost. Also you had to install something, which made it not as simple as just browser stuff. I see on Google there are SS to ActivityPub adapters too.
I tried it and I think it’s cute for very specific use cases but I think the client-side resource requirements made it hard to keep up with. I’d have to open it, wait a bunch, click on something, wait some more, and the ratio of quality to waiting just wasn’t doing it for me. It’s probably great for off-gridders and travelers though.