I think the intention is to make DistroKid songs harder to use passively. Or also because they are not exactly free music, the creators of those audio tracks get paid something as far as I know. So explicitly adding them into your place and publishing your place forces those IDs to be tied to the published version your place probably so that they can maintain some kind of ratings for that audio. Whereas letting the audios be accessed after the fact would let users play those audios without them explicitly being put in the game by the creator and they might not be able to track the plays (or usre) based on how the system is currently set up.
Whoops that’s not true. I just was able to play a DistroKid song during the game already running.
