> If Google decides to abandon Android tomorrow, or go all in on Windows Mobile OS, is that an "abuse of market dominance"?

Yes.

> In reality, private companies are free to make decisions that make sense to them.

And that's why governments should regulate them very strictly. I fully expect corporations to fuck over consumers if it makes them a couple of bucks.

> There's no law that says things should be "free", or everyone should be "happy" with a companies decision.

Most countries have regulations protecting consumers.