GPUs have been shown to be very good at complex math problems. A nation state with unlimited money could find a weakness built into crypto in a matter of days at most. A bored hacker would probably find it in a few hours.
You've been watching too much TV. Actual encryption primitives are often used with keys that would require a computer the size of the solarsystem to brute force. Bored hackers and nation states do not have such computers, no matter how well they are funded.
I'm not talking about brute forcing good encryption, I'm solely talking about nation states ability to find the back door entry. I may have confused the issue taking about GPUs.