Mobile apps are also loaded with third party ad and spyware frameworks which bloats up the size.

This also impacts emulators and other re-implementations of proprietary systems. This allows Nintendo to threaten emulator devs and make it illegal to decrypt DRM encrypted games, media, or apps you legally purchased.

Proprietary software is also really dogmatic. Steve Jobs famously didn’t support flash on the iPhone, there also was no direct access to files/file system in the UI for a very long time. Tim Cook told someone’s Mom to just buy an iPhone to access iMessage. There’s too many user hostile dogmatic positions from Apple.

I think this has nothing to do with open source vs proprietary, but rather specific individuals having power/control over the software to force specific decisions.