When Spotify came along, music piracy all but vanished. It has already been proven in other media, it needs to happen with sports and streaming in general, then media piracy will be a thing of the past.

Perhaps, but I don't think the sports leagues and other video content providers will ever agree to letting their IP be devalued that way. They see what happened to musicians and record labels with Spotify as a cautionary tale, not a model to emulate.

Otoh, maybe Netflix and other streaming video services will start their own sports leagues in order to vertically integrate and own everything end-to-end just like what they did with TV and movie production. It would be tough and expensive but maybe not impossible?

Music is the single field where copyright laws are enforced aggressively.

Plus signers and bands earn pennis from Spotify. Practically Spotify did vanished music privacy - by proving how bad a business it is to sell music and pushing the whole industry to personal branding (tours+ad revenue).