Dutch & French police take down Matrix encrypted chat app; 2.3 million messages captured

I almost want to bet this is not a coincidence but rather some security-through-obscurity scheme. This thing is completely ungoogleable, the only way to buy access to it was probably through your trusty black-market sales rep. Although maybe I am wrong, as the thing was marketed under different names, so maybe they were indeed oblivious,

Dutch police said the Matrix app was targeted along with similar encrypted services known by the names Mactrix, Totalsex, X-quantum and Q-Safe.

That seems to be the case yes. There was an encrypted chat app called Matrix, and then there's the protocol called Matrix. And in this case its about the chat app.

Whatever this service is is so small, that related articles are the only information I can find on it.

Considering one of the other ones mentioned was "ANOM" which was a LEO honeypot, I wouldn't be surprised if this is another that was named that to try to get dumber criminals to think it was the real Matrix.