It’s all there in the title.
On Brave’s help center:
“WidevineCDM (Content Decryption Module) is a DRM component used in Chromium based desktop and Android browsers. It is used to decrypt, decode, or enable playback of DRM protected video content. Widevine is disabled in Brave by default and must be explicitly installed before it can be enabled.”
So I see blocking it was a bad choice. However, is there any way to resolve this without Widevine involved?