The devs don't know all the edge cases of the protocol that they are built on top of or forked from.
A lot of bugs that I found on Immunefi were bugs where you needed to do something in these deeper layers first to achieve the bad end state.
It's a completely different focus when you're doing it out of your curiosity instead of forcing yourself to work.
There is a lot to choose from so choose whatever interests you and have fun.
Last updated 9 months ago