Kk

It is possible to create Google accounts without phone number on Android. I can confirm.

LibreTube existence is built upon Piped as far as I know. Even the developer wants you to donate to Piped instead of LibreTube as far as I remember.
Isn’t Piped the only way to easily mask YouTube history with Google? So I think we should be very thankful of the existence of Piped

What FOSS Map apps have you tried?:)

OrganicMaps seems promising for its simplicity