I've been hearing this since I was new to Bitcoin and that really scared the hell of me. But as time passes by, if there have been talks of it before about decrypting and destroying Bitcoin and its algorithm, it should have been done long ago.
As far as I know there have been in existence of quantum computers and for sure the agencies in the US and other top countries have been using it. So, why they shouldn't just use it for their own sake if they want to deal or destroy Bitcoin's network?
Because they can't, and these are all talk and it is going to cost them a lot of money to do so than whatever will benefit them after doing it.
I was also confused by the news related to quantum computing in my early years in the market. But the funny thing is that years have passed and the news is still just news, there is no more evidence to confirm that quantum computers can destroy bitcoin or cryptocurrencies. I don't know what quantum computers can do but like you said: if it could destroy bitcoin it would have happened already, not waiting until now and everything has not happened yet.
In addition, I believe that bitcoin developers will not miss any threats to bitcoin, they will also make changes and give development directions in accordance with the development of technology. So we don't need to worry about these nonsense.
