There is a market for windows on phones. My galaxy s10 is pretty much at the end of its security patch life with samsung but the hardware is still relevant by todays standards. 8gbram 128gb storage and a 1440p display,an octacore, gpu etc.
Windows 10 could easily run on this phone for three or four more years. id pay them for a license. spending a 150euro is alot better than dropping another 1,400 on a new phone with pretty much the same hardware or hardware that never really gets used.
Given the option on a new phone between google,apple and microsoft,id give windows my money purely on security longevity. phones should last well beyond 4 years.its down to pure greed that they dont.
phone hardware is now good enough to run windows without having limitations.