I wouldn't join any of telegram channels.
I don't use telegram but when I got curios and tried to make my own before and joined some channels that mainly focused with ICOs, I was so disappointed.
There will be PM's that "you should do this", "buy this" which is really annoying as I thought signals were given with best technical analysis but I was wrong.
some channels offered paid placement of the announcement of the project, but looking at what this channel post...I was terrified.
It's now one of the biggest advertising place and ICO do take advantage on it so they can make more investors through it.
They seem to give you the best signals with the possible coin that will pump and "good" project in their opinion but it's not because it was paid.
Just like this one.
I Lend my airdrop channel (14k subscribers)This is why I don't join any telegram now.