NewPipe is an Android app that allows you to watch YouTube videos without ads or tracking. It exposes your IP to Google servers though. Piped consists of a web client and a backend server, it uses the NewPipeExtractor on the server to load the video as well as all the metadata from Google servers and then serves it to you through the web client. That way, you don't have to connect to Google, only the Piped server communicates with YouTube servers.