What experience do you have in crypto analysis? Can you provide any proof that your signals are profitable?
Who cares? Now every day 10 new groups are born because people got crazy by crypto. You can create an empty channel, just add a word "Bitcoin" or "Crypto" to the name and 1000 new members will come in one hour. Most of them will expect for free magical signals (at least x5 each).
And half of them learned about bitcoin two days ago from their classmate. That's how it works.
There are very few good channels and they do not need advertising in this form.