Nah, All of India's govt system mostly run pirated Windows. The southern state of Kerala has switched to Linux though. Every 2-3 years or so, the central government announces switching to Linux and then forgets about it.
Reading about FOSS philosophy, degoogling, becoming against corporations, and now a full-blown woke communist (like Linus Torvalds)
I had cancer 5 years ago mate. Proprietary software is okay if you enjoy using it.
You can download apk from the 'Releases' tab on the codeberg page.
Being open source doesn't mean it'll get stolen lol. People can copy the code, but unless they add anything significant, everyone will keep using the most famous one. Plus there are several licenses which can add restrictions regarding 'look, contribute, but don't copy without permission' Vulnerabilities would be discovered much quickly, and people will even contribute to it. He'll still have the right to sell his app on the Play Store... or keep a premium type plan like he already has.
Skill issue