What does it matter that development has stopped? I haven't updated my software keyboard in a decade because I'm simply happy with the way it works. Why not use Nintype if you like it?

Mostly I'm worried about bit rot, i.e. breaking changes in subsequent iOS updates. But your point is valid, I'll try Nintype again. It's extremely quirky and opinionated in an entertaining way.

At least on Android, Nintype has a few annoying bugs now and has gotten terribly slow. But it's an incredible idea and I wish it would get revived by someone - I still use it despite the bugs, but I need to switch over to Gboard sometimes.