Yeah I don't the fact that it already technically exists plays much of a factor in how likely it is to blow up. Every now and then a new game/app comes out that renames some Japanese puzzle game and blows up.

E.g. "hashiwokakero/fences/hashi/chopsticks" or "slitherlink/fences" or anyone of Conceptis' (underrated) apps

Wow you weren't kidding. I just looked it up and the rules for Lingo are virtually exactly the same! 5 letters, 6 guesses, and everything