By my reading, it seems that Mayotte is the only Muslim majority "state level" region of the EU.
Basically Mayotte is a Department of France (i.e. a state, like Hawaii). It is part of the EU. It is Muslim majority, unlike the other Department in the Indian Ocean, Reunion, which is Christian majority. Also, a majority of the population speak two obscure regional languages as first languages, as opposed to French. Geographically, Mayotte is a part of the Comoros Islands, the rest of which form a Muslim majority independent nation.
This reminds me of the issue of Chinese involvement in the Northern Marianas Islands, certainly the most obscure populated area that is "part" of the US. There is heavy Chinese birth tourism, Chinese sweatshops, and I think I human trafficking. And that is is not even a state, and it is probably more Americanized than Mayotte is Francized. (Gaulicized?)
So basically Mayotte seems like a prime location for shifty stuff.