I have a folder of MP3s, some of which date back to 1999, just a few years after the format was popularised. Most of them have utterly terrible names (think RIDEONAM.MP3). I think at this point they might even survive the heat death of the universe. And they’ll still be terribly-organised.
Yep, they’re regular FLAC files with tagged metadata.
You can use them as normal. Copy to another device, to an iPod, use them on a video editor, send to a friend.
This has been going on for ages, Tidal never patched it, so I think they quietly are okay with it because not many users do it anyway and at least you’re paying for the service.