This may be true, but as someone who picked up Anki as a desktop app back around 2009 it feels a little crazy.
I also can’t imagine making cards on a phone, given how much switching between apps/windows is involved and how poor mobile platforms are at multitasking. It’s difficult to envision it being anything but maddening.
That's how some people do their "computing" these days, if they do any that deserves the name at all. I had to do some of that on vacation. With a modern phone it's possible, but mentally taxing. Phones feel like MS-DOS operating systems, where each application is fullscreen. Most people are just consumers. This is probably true for Anki decks as well. Only a small minority creates decks, the vast majority only consumes.
I also can’t imagine making cards on a phone, given how much switching between apps/windows is involved and how poor mobile platforms are at multitasking. It’s difficult to envision it being anything but maddening.