https://wayfarer.icu/faq

"Spotify requires DRM EME extensions like Widevine or Fairplay. While not technically impossible, the associated licensing / certification costs are prohibitive."


https://techpp.com/2019/03/25/explained-widevine-drm-certification/

"Widevine is free to use by the content providers and does not require any fee for license generation and device registration. Instead, all that smartphone manufacturers need to do is clear a certification process, which includes different legal agreements, software implementation, and a few other measures."

Is it free or not? Of course "legal agreements" could cost (a lot). What am I missing?