Honestly, iPhone is already there in shittyland. You need to jailbreak to do it, which you can host install GraphineOS or root your android easier for the same effect.
We need a 3rd primer mobile OS option, but won’t get one since the money always enshittifies these things.
I still have my palm pre and boot it up now and then even though it will only connect to wifi, it was a wonderful phone and OS. I’m just so fucking mad at how that all went down and every time I turn on my LG TV and see WebOS it legit hurts