[Sylos]

I once was at a dev meetup and the speaker asked who in the room used FOSS. About 25% raised their hands.

So, in other words, about 75% did not know what FOSS means or have no clue what software they're using.

I was about to say that, you know, it's probably not necessary to know what FOSS means in order to just do your job, but no, it actually is necessary. If you want to use a library, you need to have at least a basic idea of what its license means.