Mknecraft pocket edition doesnt even need the microsoft account you connect it to to have minecraft installed

The only protection minecraft bedrock has against privacy is if it cant detect if the game was bought from the play store(at least on android, i dont know about java)

You can also find a pirated version of minecraft on the play store (the exact same game, works even in multiplayer, the only difference is that it comes with a texture pack that you can remove)