Sort of. Google and Microsoft really weren’t on good terms back then (relatively speaking). Both were competing for the mobile OS market, and Microsoft ran this whole „Don’t get Scroogled“ campaign to demote Android.

Naturally, Google did not offer any of their apps for Windows phone - i.e. no Google maps or YouTube. Microsoft then made their own YouTube client for windows phone which was an okay app. However Google wasn’t happy with this and had them take down the app and replace it with their own version instead.

The problem is that Google’s YouTube app for windows phone was so embarrassingly bad that after countless 1-star reviews they decided to pull the app from the windows phone store, effectively leaving the platform with no YouTube app at all. There was at least one third party client which was decent, but there was never another official one after that IIRC.