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.
What is that? Bitcoin is "less-secured" now? How can you say that? Because of the hacks that are happening to these exchanges? No! Even if there are a lot of hacks that is happening, bitcoin is not "less-secured" because if that is the case, I don't think we will be seeing the price like this, hackers will just create a lot of btc and sell it and obviously, the price will fall down.