Big tech have basically declared that 30% of America is unwelcome on their platform. That is overbearing moderation that is likely to provoke a market response. I'd give it 6-12 months to see if they can hold on to a monopoly even leaving that massive slice of the market in play.
As for Apple, yes. They do have a monopoly over their app platforms. Either a more robust PWA support framework or side loading needs to be a priority on iOS. I wouldn’t consider Google as having a monopoly over app distribution as you can sideload apps on Android and Android has (from what I’ve heard) well-rounded PWA support.
At this point, their only option to survive would be to build their own new internet. And that would need power/spectrum/land or other things that could be taken away from them by determined enough activism.
Maybe they could survive for a while by moving to a decentralised P2P/blockchain system of some kind. But that could potentially be blocked at an ISP level.
A few years ago I heard some people say we needed net neutrality. Republicans were against it.
Like Gab and Parler! Oh wait...
I generally agree private businesses shouldn’t be forced to do business with anyone they don’t want to, but we’re talking about near monopolies that in many ways wield more power than governments.
Apple and Google each have a monopoly on app distribution on their platforms. Facebook and Twitter combined effectively have a monopoly on social networks.