It's not only CTFs. I strongly believe being a programmer at a gamejam like Ludum Dare, or hackathons is pretty much over.
https://ldjam.com/events/ludum-dare/59/setidream/about-ai-ar...
For what it's worth, the non-AI-coded entries were still quite good relative to the winners, so it's not so obvious that AI use confers an unbeatable advantage.