telegram base i think is only starting. theres a new one, just saw today promoted by signature campaign. other than telegram base, seem nothing new.
Yes it was only a few months ago now casinos can be played on Telegram mini-apps but so far have not tried it, because they do not like this small display usually for those who often play on mobile then casinos on Telegram will be more suitable.
There are already a few casinos on this forum that are based on Telegram including Playgram and Ultimatepoker maybe more will come.