It means that if we are seeing only the profit part of this deal and nothing more then we are not going to see anything greater at all. What we can see right now would be a bit of a trouble and can't grow at all. Focus on other stuff, this trend will not continue to be a thing that is big at all.
Provably that people is not there to play those telegram games, But rather they are there because there is a potential profit to get. If there's no reward to be given there's provably no one would waste their time to play on those telegram games.
Lots of people hype telegram games and promise something huge money to get by participating that's why those past telegram games became so huge. But after what happen with Hamster and Catizen I don't think if people will still have a huge trust to spend lots of time on those telegram games. Maybe there are still people will participate but for sure later on they realize that its hard to earn money on those projects.
If there's no promise rewards those people who are showing their interest will not play the game, they won't waste their time as they can find other different games online or on the app stores but since telegram games offers potential earnings that's the reason why gamers are hook on it hoping that they'll be able to catch something decent after playing the game, though reality wise, remove the potential income generated rewards we might see fewer people to play whatever games has been offered.