Google is going to keep finding ways to break these front-ends as they search for ways other than ads to monetize their services. I fully expect they will eventually lockout the public API so only the official app can use it in that quest as well. In my opinion the front-ends are just a bandaid and the real solution is something other than YouTube completely, if that is even possible at this point.
All of the front-end solutions are telling Google is that people want that content and they will come to YouTube for it one way or the other, Google just needs to figure out how to force people down the workflow that gets them the most money.