The gup.pe groups are not Mastodon groups, but Activitypub groups that the immer.space project has created according to the standards To allow Mastodon users to easily create groups to use, which can be done by Friendica users and those of all link aggregator or forumverse platforms (from Lotide to NodeBB). Lemmy also supports them, although he does so in an unsatisfactory way.

the fact that it is in the roadmap is important, but it means that it is not there. Moreover, although piefed is a well-optimized platform, bringing the following of users will certainly entail a burden for the servers that host it And we will have to understand how much it is worth: one of the nice things about reddit like software is that you cannot follow other users 🤣