IPFS and then post a link through an IPFS gateway. Some browser resolve IPFS directly, I have one in mind but I don’t recommend it.

Yes, and it suck.
I use spotify a lot, and their fake random sucks.

The distribution favorise some musics (maybe they earn more on thoses ?).
The distribution make that some music are never played, while some are played very frequently.
There is no check that the same music isn’t ran twice in a row (I know it can happen with true random).
A pure random would have an equal distribution on all music over time.
Thanks to last.fm I can track how many time I play tracks.
And I use random shuffle almost all the time.

I got a track that got played 4 times in 2024, and another 21 times, I never started the tracks by myself, it’s the random shuffle.