That's why you're good. 🤷♀️
You're not the sort of programmer he's worried about having a look at his code, tho, as you're just curious and learning new techniques or how to implement some NIP.
You still go build your own thing, often in a different language, which is too much effort for a copy-cat.
I mean, we used to reverse-engineer implementations from compiled code, and you can soon probably have AI do that for you.