Meh, the feature is easily deactivable, the settings are clear and extensive. As far as ads go, it's one of the best implementations. Firefox still has no alternative in the privacy / user-centric space (don't mention Brave, I'm gonna get mad). Mozilla has done a lot for the web, I can give them some slack for exploring different revenue models. Still, I'm going to keep on eye for this kind of practices in the future…
Except they have used the language of "not now" and hidden the link away instead of making it a button with equal prominence to the yes button.
That's not the behaviour of an organisation which thinks its users will be happy with what it's doing, it's the behaviour of an organisation which is trying to trick them.