"He has kind of an old-school cyber-libertarian world view where technology is there to set you free," Maréchal said. Despite Telegram's origins, its approach to users' security has privacy advocates worried. Groups are also not fully encrypted, end-to-end. This includes private groups. Private groups cannot be seen by other Telegram users, but Telegram itself can see the groups and all of the communications that you have in them. All of the same risks and warnings about channels can be applied to groups. He floated the idea of restricting the use of Telegram in Ukraine and Russia, a suggestion that was met with fierce opposition from users. Shortly after, Durov backed off the idea. Perpetrators of such fraud use various marketing techniques to attract subscribers on their social media channels.
from pl