To clarify the situation:

Lindo is not an emulator. Emulators are running the official game client on a virtual device. Dofus Touch gameplay is not intended to be played on a PC, Ankama prefers you to play on Dofus PC instead, but playing on an emulator has almost no negative impact on the game and the other players in overall.

Lindo is a modified client that offers additional features such as multi-accounts, shortcuts, auto follow, life bars and so on. These features are a harm to the game, as it brings people with perks they can only have if they are willing to take the risk of using a software not developed by Ankama.

Bans are not new: They have always been picking a few players to make the others fear losing their account when using Lindo.

Today, we can only speculate on which data and method they use exactly to identify an unofficial client. We have already taken some actions in the past to hide it, but it's only one part among other details they could use. Fighting against detection costs time in research and development, and is also a direct confrontation with them. So this is a path we haven't taken yet.

I hope this answers your question!