explain the dynamics of how enshittification would work here?

You won't get good answers asking to be spoonfed on a random discussion forum by strangers. If you're truly curious, look it up, maybe read a book by Cory Doctorow.

he's a charlatan

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You seem very confident for someone who just asked about enshittification basics. You're being dishonest.

you think i was asking you about the basics but i was asking about how the dynamics would work in this context - which you couldn't so you resorted to some insults.

People stay on the shitty platform because it is convenient and still does what they need.

See extreme-enshitification-of-already-shitty Windows vs free Linux.

free linux is a way worse product

Linux is becomming enshitified, at least the big distros. Snaps, some would argue systemd, wayland, etc. Continually requiring more and more resources just to install and run.