I don't think Firefox's position is unreasonable here. Ultimately, the old way of distributing copy-write content wasn't going to work. Companies that had right to something, couldn't easily distribute it without a large risk of piracy and a tanking of revenues. Having a sandbox around proprietary shite made sense and protected users privacy while also enabling the content providers to maintain their asset.

Removing ad blocks is a wholly different ball game. Google obviously has a stake in it because YT is funded by ads. Maybe some ad driven content providers also, but subscription driven services don't have the same need for that. It does seem an unholy alliance between content providers and big tech has been formed and it could be something at play again.