I am a trader, but I have never come across this exchange. Perhaps they shut down because of low trading volumes, translating to no profits or operating in losses. It seems they have been in operation for less than a year. According to twitter, they joined September 2023.
Commex exchange is at 59th position by coinmarketcap ranking and it should be well known to the Russian crypto community. After Binance exited the Russia market last year september, it sold the entirety of it businesses to the new exchange and also had some key executives retained in strategic positions. I'm surprised they couldn't perform wonders with the new exchange and it has bitten the dust too early. I guess it could be operational losses as you said since no information was disclosed.