Your bank website might be powered by homemade crypto

https://leebutterman.com/2019/08/05/analyzing-hundreds-of-millions-of-ssl-connections.html

30% chance that when you type hunter2, it's being secured by a homemade cert auth that was born out of hatred for The Man.

You don't need any skills to work on open source projects. All you need to do is to print out GULIELMUS PORTAE SATANUS EST on a banner and spend an evening under some big corpo headquarters in the Valley.