Watching youtube videos using Google's bandwidth, without watching any ads or paying for sub, I don't see how this could be legit in the long term.
I wonder why this is being downvoted - Google asks for subscription for features that this app hacks for free. In any other context this would be deemed unethical (or even piracy). E.g. think of an application that streams Apple Music without paying Apple or distributors of cracked apps with enabled in-app purchase features. And yet the HN community happily endorses such apps when it comes to Google. I also wonder wh…
I'd like to focus on a single point here: background playback. If anything, it's Google that's stepping over the boundaries in this situation, trespassing the typical boundaries of an app and breaking the natural interaction model. How I consume (or not) the output of an app should be none of its business. I expect to be able to switch windows, minimize, look away, turn off the screen or mute the volume without the app knowing and acting differently. Forbidding me to do so is an artificial anti-feature and doesn't bring me any sympathy towards Google and their paid offering.
I would keep using NewPipe along with the official app even if it showed ads (which I consider tolerable in YouTube's case) for sanity-restoring features like this one.