"Overbearing" is a matter of opinion. It's important to appreciate that there are different expectations of government in different regions of the world.
Sure. What's more important is regulatory certainty so companies can operate in a stable environment. One challenge is when people expect governments to act to counter what appears to be targeting their country's companies to favor their own, based on their views of governments roles, pitting markets against each other.
Most multinational companies are sensitive to this and adapt accordingly.
No doubt Apple will adapt and find ways to continue to make money off of the App Store. The question is "how will it impact developers and customers?" I suspect it will have more impact on developers than customers, who already enjoy low app prices.
Apple could chose to replace a flat fee with upfront, fixed, and variable costs based on popularity. A developer could wind up paying for a developer account just for access, fees for reviews, and a monthly hosting cost. Then there would be a per d/l fee as well. IAP would incur a separate fee. Apple could change the way free apps are charged as well, so apps suh as Amazon, Netflix, banks, government agencies that use apps to facilitate interactions or commerce pay fees, as opposed to utilities and apps that don't.
Now, a small developer, who has no upfront fees except a tiny developer fee would have to lay out cash up front, with no promise of recouping it, let alone making a profit. I suspect many smaller developers would find the App Store unprofitable and wind up exiting the business. Big developers, who can afford the up front cash, would be the survivors.
If Apple allowed sideloading with sandboxing, much like on the Mac, third party stores could exist but are unlikely to less costly nor have a customer base anywhere nearly as lucrative as Apple's.
In the end, Apple will adapt and protect much, if not all, of its App Store revenue.
However many of the tech companies ... Apple is not the worst offender ... behave arrogantly, expecting to be able to do what they like.
Tech companies have long claimed the internet is different and not subject to the 'old' ways markets work and are regulated. It certainly has changed how they work, and tech companies are learning, however, it is not a free for all, winner take all world.