Simply being open doesn't make them good open source projects. Luckily the SPI shouldn't need to conform to Apple's release schedule, and should operate mostly independently, so the worst aspects of Apple's open source projects will be less of an issue.
No true Scotsman…
Even simpler, this is a "no Scotsman" scenario. Apple has unprecedented contempt for Open designs and software standards, even compared to the pitiful example that Microsoft and Google set.
Unlike them, Apple takes a stance of contravening the public good to emphasize lock-in. They refused USB-C for as long as possible to sell licensed serial connectors that their Macs didn't even use. They fought tooth-and-nail to politicize the free distribution of software when the EU wanted to enable sideloading. They abandoned open initiatives like Khronos, for no reason other than to screw over cross-platform developers. They give Safari special OS entitlements that they refuse to extend to competing mobile browsers, and then justify it as if they can't write a safe OS.
There is no company on planet Earth that goes this far to undermine FOSS. Apple is the fakest Scot.
Yes, Apple is quite selfish when it comes to open source. They avoid GPL license code because they only want to selectively share their code, which is one of the reason they now avoid GCC and stopped utilising GNU Coreutils in their OSes. It supports developments of some popular opensource apps (like Blender) because it is very popular and not having it on its platform hurts it. And now, by charging developers an annual fee for distribution through App Stores, they also prevent many non-commercial open source applications from being available on the App Store. As Apple also further makes money from any commercial apps through the app store (by extorting a commission from them), it doesn't really want such popular free opensource apps to compete with the commercial apps - every time someone uses one of these free apps, Apple also loses money. Thus, by gatekeeping distribution Apple now effectively cripples the growth of open source applications on its platform. (The only reason a few of it - like VLC, for example - still survives on the App Store is because some kind people donate the money to pay Apple's fees - a waste of money and a shameful act for a trillion dollar company).
Dude. Apple basically created USB-C.