Wait, that's not how app development works. Writing a well made app does not somehow allow one to circumvent ToS, which Microsoft very clearly violated.

I'm sure if Microsoft merely removed the ability to download videos and restored ads, Google would not have any problems with it.

The fact that MetroTube is so successful disproves the conspiracy theory that Google is trying to prevent Windows Phone users from being able to use YouTube.

This isn't a "We don't like WP" issue, this is a "your app blatantly violates our ToS and we're not okay with that" issue.