A group member is someone who once tapped "join". A commenter is someone who read a particular post and decided to answer it. The difference in temperature is large, and collecting them is no harder.
How it works technically
Comments under a channel post live in the linked discussion group. A commenter is therefore a group member who wrote something — for a parser, an ordinary group with an extra signal: who wrote, when, and under which post.
Why it beats a member list
- Interest in the subject, not the channel. Someone replying under a post about choosing a contractor has declared a specific job.
- Recency. A comment from last week is a fresh signal; joining a group could have happened two years ago.
- The account is alive. People who write are people who open the app.
Same logic, wider scope: finding active users.
The limits
You can only collect what somebody showed publicly. No username means no way to write — users without a username. Closed privacy settings mean the same in practice — why part of your list is unreachable.
What not to do with it
Mass-message everyone who commented under someone else's post. The channel sees that thread too, and the reports arrive quickly — why Telegram restricts accounts.
What to do instead
Be present rather than intrusive. You now know where conversations in your field happen and who takes part; the sensible move is to answer there, in the thread, rather than to write first in private — comment marketing. If outreach is genuinely warranted, start with the first message: cold outreach.
How Neurogram does this
Everything above is manual work that runs into the number of hours in a day. Neurogram does it on your own accounts and without you: it collects channels and audiences, writes comments and replies with a language model, and keeps limits and quiet hours so the accounts survive. See pricing or look at your case.