[Animats]

There are other watches with this. Withings is FDA-approved. Garmin and Samsung have several models. There are non-Apple watches which will pair with iPhones. And there are Apple watches without a blood-oxygen sensor. No big deal.

[solardev]

How did the other manufacturers get away with this? Did they actually license the patent, or are they the next victims to get shut down...?

[Frost1x]

I haven't dug into this in-depth but from what someone who had mentioned, I think it falls into a very specific approach they're using around an array of 4 sensors which is patented. I suspect other manufacturers use different approaches that isn't patented here. Again, this is secondary information so take it with a grain of salt.