But the mobile market is filled in now and android is the windows of mobile

This isnt a magical new market.

5k users down 999,995k left to go!

If they don’t today I’m sure steam deck will help encourage.

I think the security thing is very arguable at this point. Windows and macos are both extremely secure (from threats external to the companies that made them).

Linux still has heavy reliance on running install scripts as root. Flatpak avoids that but has its own issues. Docker has its own suite of issues. Snap is just issues.

Audiobook shelf is great, and they have several good client apps in addition to the browser app.