I highly doubt they have a device ban because my old account that I used this cheat on is still not banned when my other accounts are banned on the same phone. For now, I'm quite positive that you get banned if either you get reported by a user and they manually check you OR if you keep switching between the official app and the sideloaded app on the same account. Have you done any of these? Another possibility (though I don't know much about cheats and anti-cheat) is that the devs might have marked you somehow (maybe the device). I might have not been marked because I was most likely banned by their anti-cheat and not manually. This is just a hypothesis.
A question to Laxus: First, I'd like to thank you for the constant updates and so far cheat seems reliable. Do you know if I later switch back to the official app into my account and a dev manually checks it, will they see any signs that I've played on a sideloaded app (on the more technical, server side and not things to do with resources, scores, and blatant signs)?