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Jeff Bezos said the quiet part out loud — hopes that you'll give up your PC to rent one from the cloud
(www.windowscentral.com)
This is a most excellent place for technology news and articles.
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.
The main driver for lock in is hardware. Like I said in my comment