Looking at "Fontly Color Fonts", and some of their other apps, they are mainly repackaging websites as an app. For example check out the actual website at - https://fontly.org/
I don't think that's necessarily a "bad" thing but I hardly find it reasonable to believe they are charging for the privilege.
That app does not seem like a wrapper around that website you linked at all. Can you give me a specific example? I may just not be seeing it. One is a blog and free font repository, kinda. One is a collage maker.