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I can anecdotally say that I'm hearing a lot more about STMs than about NXP microcontrollers.

Hobbyists and tinkerers like us are somewhere between completely irrevelevent and mostly irrevelent when it comes to market share.

Because you're in the wrong industry. Very big in automotive.

Likely true. In Automotive and likely also some other industries also Renesas is huge. However in hobby circles one never hears about them.

I take apart prosumer audio/music gear quite often, and STM32s seem quite popular there. Not sure where that is in volume, though.