No, it’s another company, but I know nothing about them.

Bit of both. Actually I think ARM the ISA overall is in good (even great!) shape, but it’s the GPU and other SoC functions which cause the most headaches.

Qualcomm had an exclusivity deal with Microsoft which has expired. I think that’s what is causing them to put relevant code in mainline.

Snapdragon hasn’t had mainline kernel support and has always been a pain to set up, enough so that nobody does it. This is using a snapdragon processor. Those are also fairly powerful.

Mpd.

English speaking it’s a solid 5% now, so I’d say it’s one in twenty.