I'm impressed that someone was still able to exploit the Nintendo DSi browser 15 years after it was released - that's quite the accomplishment! It's certainly commendable that you and the two developers dedicated a lot of time and effort to porting the browser. That said, I do think the fact that the code was exposed for so long played a factor in the exploit happening. With cyber security being such a critical issue nowadays, maybe it would have been best to have more resources available and look into ways to secure it better further down the line.