Ask HN: Boostrapped mobile app companies at scale

I was intrigued if anyone could offer credible examples of app-first or app-only businesses that have achieved some sort of reasonable scale, perhaps say $50m+ ARR. And that aren’t games. Usually the pointers to IndieHackers etc draws examples of <$1m businesses, which is fine. Just curious if companies have hit scale without significant funding and if it’s possible, given the rising CAC associated with mobile. I could only think of Freeletics.