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.
Telegram Casino is still indeed part of the current trend; new ones are coming, and they are just trending with their promotions and new features, and people are diving into it and trying out the new games.
The only time the trend might die off is if there is anyone that can compete with them, and one thing about Telegram Casino is that most of them don't talk about KYC, which is the reason why many people are running from the regular casinos.
yes, it is indeed a trend at this time, a lot of casinos are built with telegrams, but whether it is interesting or not is subjective, although there are many new features and conveniences but not necessarily everyone likes it.
Regarding KYC, I think it's just because the government hasn't smelled it yet, or they are doing research first, however the mandatory provisions on casino operations require KYC for protection and supervision from the government, just wait for KYC to be implemented, I'm pretty sure about that.
If not, maybe the Telegram apps will be banned by the government, like what happened in my country, they threatened to block Telegram.