The Linux kernel is also a huge amount of code that has been worked on by a lot of people for many many years.
There are certain types of bugs that are too obscure to realize are even there for a person alone. And there are types of bugs that even if you see that something is funky it is too time consuming to dig into for a human.
I am not saying that the Linux community is not doing great. They are doing a fantastic job, and have been for years, and they are giving all of that away for free too which is nothing short of incredible.
What I am saying is that I think AI allows everyone to find even more bugs than was humanly possible without AI.