Since they know a major announcement is coming and that it will be a great time to sell, they willingly go and put downward pressure on the price by spreading negative news and putting a lot of their tokens for sale on the market. (if you own 80% of the tokens on a given exchange, it's fairly easy to do)
Sounds unethical.
It's the trading game.
I meant "put downward pressure on the price by spreading negative news" not selling tokens. So the trading game is unethical? I wonder does it have to be.