nope. You just option+click it then select yep, I want to install it. That's it.
Also it doesn't mean it's insecure, it means it's not in the Mac App store.
steam is available on linux. If you want non-drm games then use GOG. And there are MMOs on linux, too. But yeah these type of games are client-server based.
not really. The phone was nice, the OS was ok. It just as with all markets first comes takes it all. Google made a free OS and only that could compete with iphones. Also most americans I know use iphones.
steam runs on linux. Minecraft runs on every systems. GOG sells non-drm games, they even have linux binaries ready to download.
Glad to help, you're welcome.