Not everyone had some massive record collection and hundreds of cassette tapes.
Today, those "cool" stations have primarily been slurped up into iHateRadio / Comcast conglomerates, so commercial radio is useless. The internet is the only saving grace for kids today, but even streaming platforms don't do it for me. Sadly, youtube is about the best thing for its ubiquitous availability. Bandcamp/Soundcloud are cool, but still not the same discoverability as YT.
Even with my collection, it's still not instantly accessible as I'd like due to the manual labor of digitizing. I've tried on multiple occasions, but it's only a fraction of the collection. It's just too easy to find it with yt-dl
These platforms aren't necessarily drawing people who really wanted a big privately curated music collection to own forever, they're drawing the people who just want to listen to music and not have to spend much or anything at all for it. Which happens to be a ton of people.