So there's high quality and low-quality airdrop? I thought that it's just about legit and scam airdrops. What specific forum you are thinking of being involved in these airdrops? there's no need to set up a telegram group because later on there's a tendency that it will also become a group for marketing.
If you find some airdrop which you are doubting of, start to ask people here and we'll reply to you what we think about that airdrop that you are interested in.
Two of the telegram groups that I hate joining are the airdrop and the binary group, they are full of deceit and false marketing and they are adding people without their knowledge and they are spamming other group channels too, giveaways had a bad reputation right now because of those fake giveaways by big companies so I rather not join and I encourage other.