Companies in quite a few industries have a duty to do business with you, with very few limitations. For example, in some countries/cities, taxis generally can't refuse transportation to you, assuming you're able to pay and not endangering the driver. Having publicly and repeatedly expressed a dislike for taxis, or even wearing a t-shirt saying "taxis in $city are an overpriced monopoly" would not be a valid reason to be refused transportation.
In the EU/under the DMA, Apple now very likely has a duty to transact even with app developers saying mean things about them. That's certainly a very new situation for Apple, but not an unprecedented one.
I'm not sure if throwing more hissy fits and breaking more of their playmates' toys is a good idea now that adults are in the room.