Not worth it.
Automation is good, but it will be pure spam, telegram is not such a stupid social network and most likely you will be banned in one way or another in all groups or chats, because you will look like spam. Ultimately, you will either have to switch to buying accounts, proxies and all that in order to put it on stream and make big money. (Like I had with the instagram in 2017, a lot of time and money for tests, bans, studying information, and so on. The one who comes will know.)
I think that's why neither in the book nor in the thread you will find statistics of affiliate programs, nor proofs of earnings.