Please, it doesn’t help anything to publish unfounded conspiracy theories. Apple already publishes open source projects and has a bug bounty in which they pay for security vulnerabilities in some areas of iOS. It’s ludicrous to advance the theory that they hatched a plan to leak this important project to Reddit instead of through one of their official channels.

Risky strategy, it depends on who does the review. (It should be a motivator for white-hats to dig into this - black-hats surely will).

Only applies if there are significant bugs. Presumably Linux has fewer of them than Windows, but it's hard to say as Windows gets a lot of attention.

The source code for Windows is available if you meet certain requirements: https://www.microsoft.com/en-us/sharedsource/