FWIW I do have 2 Linux phones and… they work. The problem IMHO is that non-software companies believe THEY can lock or profit their customers via an “app”. If they only provided a Web page instead rather than a mandatory mobile application then it wouldn’t matter so much.

So, despite have working Linux phones (albeit far from perfect) I’m still relying on a deGoogled Android phone so that I can run mobile “apps” for only a couple of, quite important to me, services.

To summarize, I don’t think it’s the OS themselves that fuel lock-in but rather apps that require those locked down OSes.