Incidentally the only Bubble app I've seen online was mentioned in the Bubble FB ad: Revetize. It actually made me do some research when I saw the ad last week as it seemed so absurd.

https://nocodefounders.com/interview/revetize-interview

0 results on the Apple app store, but there is an app on the Play store called Revetize with "10+ downloads". Perhaps that's it?