It couldn’t possibly be your premise is flawed could it?
For modems, yes, but only because there's even less competition in that area (which is why they bought Intel's mobile modem business, but failed to produce a viable design in all the years since).
They've been running their own SoC designs since the iPhone 4 era in 2010.
Since manufacturers didn't demand long support, Qualcomm didn't provide updates for their SoCs. This meant Fairphone couldn't support their phones even if they wanted to, which is why they used am automotive chip in their new phone — which is nearly the same as a phone chip except the 13 years of updates.
Isn’t that the free market working the way it should without government interference?
It took Apple, flush with cash from iPhones and iPods, a decade worth of work to create a SoC able to throw punches at eye level with Intel and AMD, which themselves grew to the unholy duopoly over decades. Chipmakers have it even worse: TSMC has all the cards, Samsung and Intel have completely fallen behind with no chance in sight that they'll match TSMC any time soon. All the other competition has gone bankrupt or stopped at lesser nodes because they couldn't keep up the pace.
There's no disrupting that, not even if you are an actual nation state.
Geeks just always hate when normal people make their own choices using their own free will.
Every failure that you cited were well funded companies who failed to execute. Amazon, Facebook and Microsoft failed trying to introduce phones.
The market worked as it should - poor execution led to failure.
They have chosen not to.