Indeed, what others have said. Bandcamp files are DRM-free, and they say as much on their site. The only time I use their app to listen is when I'm driving, since the app plays nice with Android Auto, but you can use any capable player you wish. I have probably purchased around 200 albums from there over the years with an average of about $12USD per and discovered TONS of new-to-me artists from there. It is my sole source of music these days and all my purchases are backed up on my home media server in the event Bandcamp shutters its doors or does something ethically stupid.