It's a good idea for the people with GPU miners to share or leak them. Block rewards are small, and the FUD is hurting the price and any profits you make with a GPU miner.
We are talking about humans here. Humans are by nature greedy, selfish and only interested in advancing their own interest at the expense of others. Most people do not care about anyone else but themselves and will do anything and everything to keep their advantage at all cost. Here and there there is someone that is actually willing to give, share or help others, but they are very very rare. This selfish attribute of humans is what is making crypto a dark and ugly place as they don't mind killing a coin as long as they can make a few buck before they move on. It is what is driving the behavior in crypto 99%.