Loved it, don’t know if all the actors sang themselves or if they were dubbed, but it was a very strangly enjoyable episode.
I think OP doesn’t mind paying for an app, it’s the “collect data” that was his issue. If the free version collects data to send you ads, and there is an option to buy and remove the data collection and ads, then that’s probably fine with most people.
You probably already know this but you can still use it using rebble.io