Telegram mini apps are on the trend after Notcoin became successful, the average user of that mini app earn $100 each worth of tokens. After that, there are lot of projects coming in Telegram to make a mini app and some of them were also successful and then followed by the DOGS which was created also with the same owner of Notcoin, that's why CEX's are also joining the trend so that it increase exposure especially those old exchanges. They are just following the trend, nothing special.