I am in a couple of them

Another common tactic is they'll act like they are experts at TA, and indicate certain coins will hit X price. However you'll note many of these coins have low volume so the admin will indicate at 20% increase on X-Coin, but in reality , for the X-coin to go up 20% , it would a purchase of 1 BTC.

Waste of my f* money.

Best one is "Life time membership". Like those F*ers going to be around my whole life