It turns out they forked Mastodon but are lying about it and aren’t complying with the AGPL: “Truth Social doesn’t comply with that license and, in fact, refers to its service as “proprietary.” Its developers apparently attempted to scrub references that would make the Mastodon connection clear — at one point listing a “sighting” of the Mastodon logo as a bug — but included direct references to Mastodon in the site’s underlying HTML alongside obvious visual similarities.”