Thanks for clarifying. Judging by their average daily revenue currently and the number of users it sounds like they are not using their full potential. But if you check their last 50 ratings you’ll see that a lot of them are one star ratings mostly because of ads in the newer version. If they try to add more ads in the app it would significantly lower the number of active users. It is popular because it was ad free.
I beleive now that they can get their money back but they need to put a lot of effort and research in making this app better and at the same time add more ads. If they only try to add more ads they may get their money back but it would kill its potential.
These are just my thoughts.