I guess not few of those who try their luck quickly discover that Friendica is, in fact, not a pure group/forum platform, not "Guppe, but it's moderated", and too confusing and difficult to wrap their minds around. The step from Mastodon to Friendica is much bigger than the step from Twitter to Mastodon.
c) ActivityPub is off by default, not to mention d) how to turn it on which is anything but straight-forward.
Are the add-ons more complicated to "install" than in Firefox?
And what about Hubzilla's translation functions
or German-language communities?