I'm ok with missing those people, they already have a nice stable big company job they are happy at. There is a lot of value in that and I'd never want to take that away from anyone.

In high school, we were all told that in order to get into college, you needed to have extracurricular activities. I consider spending some time at night or on the weekends on an open source project part of the deal of being a software engineer. Not everything needs to be taught or done on the job. The people I want to hire make their own time to learn and grow.