[confident_inept]

It's not even a matter of having his work backed up. He still has the code. He no longer has access to the entire Google ecosystem and there is absolutely no other viable alternative for mobile.

[vertis]

This isn't completely true (though it might as well be).

It's possible to install Android apps without the Play store.

[theshrike79]

Install, yes.

Sell? Not so much.

There is Amazon's store and you could theoretically sell the .apk on your own site, but still.