Premium streaming services that are free software compatible (DRM free)

I thought such a thread would be useful during COVID-19 lockdown.

Anyway, I noticed WWE Network works either through Streamlink (with sync issues unfortunately) or via a GPL licensed Kodi add-on (which doesn't suffer from sync issues).
https://github.com/freyta/plugin.video.wwenetwork/archive/master.zip

Registering does require using non-free services (PayPal, JS).