Now you can Unsubscribe from all YouTube channels in one click.
How to do it:
1. Follow the link - https://www.youtube.com/feed/channels.
2. Open the browser console with the F12 key.
3. Select "Console".
4. Copy and paste this text.
5. Press "Enter".
Ready! The main thing is not to forget to save interesting channels in a separate text document, because this action is irreversible.