In my mind, it came down to how challenging it would be to produce and monetize content. It's non trivial work. Producing a good radio show that's worth listening to takes a lot of time and effort. Podcasts are a good example here. I think there's data out there that suggests most podcasts don't have more than 1 episode or survive the first year. Without a good way to monetize, it's not worth the effort.
So while easy in the short term for celebrities/influencers/celebrities/VCs to jump on the bandwagon, the effort wouldn't be sustainable or worth it to them in the long run, and then you have a content problem again.
I also experienced some dark onboarding patterns while I checked it out that make me suspect their growth numbers were a bit over inflated, in an ask for forgiveness later kind of situation.