I don't follow how ALAC promotes a harder lock into their walled garden. If you have a file in ALAC (not a streaming instance, an actual file), it can be converted losslessly to FLAC. Moreover, ALAC has been open source for almost 10 years. Android plays it fine, as does linux.
iPhones have supported FLAC natively since 2017. There's apps that play back FLAC files in the App Store.
So, overall, I don't see what's sad about it. Apple Music is a subscription service that's streaming DRM protected music. Whether it's FLAC or ALAC doesn't make a difference to the user.