This is really really true. there are a lot of telegram groups with mostly fake members. So you join a group thinking that the over a thousand members you are seeing are legit, but truth is they are fake or mostly bots. I recently found out that there are ways and people who 'sell' members to telegram groups that are interested. So don't get carried away always by the number of people you see as members of a group, it is very possible that they are fake.