His grand vision remains to leave Mastodon users in control of the social network, making their own decisions about what content is allowed or what appears in their timelines.
I don’t use Mastadon cause I don’t care for micro-blogging, but nevertheless, I like this.
Right, Lemmy is very different from Mastodon, even though both use ActivityPub and can thus communicate with each other. Unfortunately, I don’t know that much about those platforms two platforms, other than that they do exist. You can find a ton of active open-source ActivityPub projects to explore on this list: https://github.com/BasixKOR/awesome-activitypub