Many. And still, many more are bought up every year. Those small M0 and M0+ cost pennies... if you made all chopsticks in the world out of M0s instead of wood, it would be more cost effective lol

(okay, maybe this is an exaggeration, but these small things are pretty much everywhere... not even speaking about chips in other, more complex devices)

Well thank goodness for RoHS!

Only the ones with locked^H^H^H^Hsecure bootloaders.

In other words, nearly all of them.

I've started calling it "Landfill Boot".

I remember there was a disposable COVID test that had an arm processor in it.

I think that the price of those tests was about $70 each, however.

Certainly quite a few, there are ARM chips in single-use products such as COVID tests.