How to send bulk telegram messages to usermames?

Surely this method will not work with telegram. Because telegram is a very strong place where you don't get the chance to send bulk messages.

Another official version of the mailing list is to create a public open chat. In Telegram, this is called a "cunning" way to send messages to specific users in person. In one chat it is possible to unite up to 5 thousand users from the phone book. In other words, create an analog of SMS-mailings, having collected a sufficient number base. But for any message about spam, Telegram punishes by blocking the account for at least a week.