Younger folks have been raised on apps and other polished devices with oodles of effort put into UX design.
Older folks grew up learning DOS commands, memorizing the IRQ of their sound card, and other clunky shenanigans.
In their current state Lemmy, Mastodon and other services are too complicated for most young folks to bother with. Not all, but most, especially the filthy casuals.
That's funny, I used to know an Italian with crabs.