Also on masto: https://octodon.social/@aspensmonster
Keyoxide: https://keyoxide.org/79895B2E0F87503F1DDE80B649765D7F0DDD9BD5
Been using it for a little over a year, I think. No complaints about the service itself, though its founder, Vlad, is of the opinion that moderation of search results is simultaneously a bad thing that should not be done, and a benefit to users, depending on context. Typical libertarian-brain in that sense.
The AGPL does apply when interacting with the covered work (Lemmy server) over a network. A proprietary client would still nevertheless be required, upon request, to furnish you with the source code of the covered work it is talking to over the network (the Lemmy server).