I think of a “mobile device” as a phone, tablet, and smartwatch, but those latter two categories are dwarfed by the market for phones, so I think they can be ignored. Laptops are dominated by Windows and macOS (BSD/Unix descendant, not Linux), so that can also be ignored.
A few sites of questionable reputation put the global market share of iOS at around 30%, but let’s suppose it’s only 20%. In order for 99% of all mobile devices to be Linux-based, then only 1% of the total could be an iOS device, and roughly another 4% of the total is every other (presumably) Linux-based phone. That leaves 95% of the “mobile device” market for non-phone devices, which seems unrealistic, even accounting for industrial and commercial devices.
I think of a “mobile device” as a phone, tablet, and smartwatch, but those latter two categories are dwarfed by the market for phones, so I think they can be ignored. Laptops are dominated by Windows and macOS (BSD/Unix descendant, not Linux), so that can also be ignored. A few sites of questionable reputation put the global market share of iOS at around 30%, but let’s suppose it’s only 20%. In order for 99% of all mobile devices to be Linux-based, then only 1% of the total could be an iOS device, and roughly another 4% of the total is every other (presumably) Linux-based phone. That leaves 95% of the “mobile device” market for non-phone devices, which seems unrealistic, even accounting for industrial and commercial devices.