Apple are throwing more roadblocks at least partly because developers are becoming more and more deplorable, trying to claw every penny they can by collecting and selling every bit of metadata (or even data) they can get their claws on. Microsoft aren't throwing similar roadblocks at least partly because they're one of the deplorables people need protection from.

All big software corporations use open source strategically: keep the core money-makers closed, release tooling and other trinkets for developers so that they do some free advertising for the company. They also release expensive-to-develop software for free to destroy competitors and expand their influence.