> YouTube to kill Windows Phone back in the day also.

I hope you're not referring to YouTube blocking the 3rd party YT Windows Phone client that didn't play or display ads? At the time, Microsoft was threatening Android OEMs with patent infringement (without disclosing the specific patents!), and making it go away if they agreed to make Windows phone models[1]. Google refusing to make a first-party YouTube client for Windows Phone was to be expected, it was an ugly, hand-to-hand fight and all parties used the weapons they had at hand.

1. The agreements were never made public, but HTC and Samsung disclosed they'd be making Windows phones in their respective agreements with Microsoft. Microsoft also initially filed an Amicus brief in Google v Oracle - supporting Oracle's position.