As you’ve said given it's a project done in their freetime I don’t have any expectations.

At the same time when I design a project I want to share to others (in my free-time too), I always think about making it working for the majority of the users (mobile in that case).

I do too, but usually not until I've first validated the idea is interesting to people. Not much sense in optimising the wrong thing.

It's for us geeks, not the majority :)