[hnfong]

Does that involve a ban of stackoverflow use as well?

https://stackoverflow.com/help/licensing

I don't think I've heard anyone warn people not to copy code snippets from stackoverflow due to licensing issues, although "real" businesses should be rightfully concerned.

[gkbrk]

It's already a common practice to put a StackOverflow link as a comment when you copy code from them. It provides valuable context to future readers.

That's probably enough for attribution, but I suppose one could copy the author name as well.