Well duh, but those policies only exist because YT is trying to sell those features.
> He's lucky they didn't choose to go down the lawsuit route instead.
Lucky? It's a toss-up whether policies like this are actually enforceable. Most likely all they'd be able to do is block the devs access.
I'll take this as my stance on this matter: a user or program should be allowed to do anything they choose with the bits they receive. They can alter, modify, ignore, strip, or save any part of it.
This app operates in the same area as ad blockers. Would you argue that uBlock should be taken down because YT wrote a policy demanding that browser software must not 'enable or encourage' the blocking of ads.