WHY ASKING TO MANAGE MY YOUTUBE ACCOUNT WHILE SUBSCRIBING?
Google doesn’t let anyone manage your account no matter who you are. It’s just YouTube API’s which requires your permission to subscribe to an account. After subscribing us via our website, you can remove Bermix Design — Photoshop | After Effect | Cinema 4D from your Connected Apps list. I don’t have any power to manage your account. Anyway, if you still believe that we are using somehow your account information, you can remove it. To remove Bermix Design — Photoshop | After Effect | Cinema 4D from your authorized list:
Go to YouTube Settings
Click on ‘Advance’ link
Scroll Down and Open ‘Authorized Sites’ to your Account