With your logic, Google should give us their search logic/libraries, so we can build our own search engines.

You ain't making sense. Companies need $, and what's wrong with what they do with what they own and can do in this particular case?

I don't know, it seems like it's just fun thing to play around with. I don't think serious things are meant to be built on this.

I often want to play simple games like Pacman, space invader, breakout, tetris or some other random iteration. Sometimes there are non-spammy simple versions of this game but often there aren't. This seems like a pretty cool fix. And if they disappear in the future, who cares?

Because many devs don't pay for tools unless forced otherwise via a network paywall.