You might be pointing out on hackers planning to attack exchanges and other platforms that are holding bitcoins. This attacks really make bitcoin and cryptocurrency less secured as of now. This is a long-time issues that still need to be resolved.
Hackers is always a threat of crypto security but on this current situation that the rise of bitcoin is subjected to be hack maybe its only an assumption and nothing is proven true and that is a kind of a fud to destroy crypto currency to frighten the investors and make unnecessary dump, so we should be vigilant on all our moves in crypto market.