I'd be a lot more amenable to allowing Apple to make as much money as they want on controlling the only gate into my phone if their only incentives were monetary, but the moment they started making political decisions (banning all vaporizer apps, removing the Hong Kong flag emoji, banning Parler, etc) I was no longer on their side. You can agree or disagree with their decisions on each individual case, but as a liberal I'm not comfortable with a private organization having that much power over public policy. On some level I want to give Apple a way out. My best hope for the company is that they'd prefer not to be making political decisions, but have to bow to external political pressure. I'd like us to help them out and take the decision out of their hands.
As to being able to leave Apple. The amount of work it would take for me, a professional Software Engineer, to decouple all of my contacts, data, personal photos, text history, etc from their ecosystem effectively locks me in. They created a marketplace, and when you create a market in a free market society we'll take you up on it and enforce anti-trust laws. The idea that they don't have monopolistic power is demonstrably false. In fact, I think Apple's monopoly is the most clear cut in the tech community.