Neither desktop Chrome nor desktop Firefox are pushing their own, competing method of distributing content that can't be adblocked and that they take a 30% cut on. Also, Firefox at least didn't intentionally add support for adblocking, they just had a powerful add-on system and didn't deliberately stop it.

Apple is deliberately adding support for it on the web whilst pushing people to distribution channels they control that they don't allow adblocking on, and that they get a cut of the revenue from.