I think you’re putting a lot of faith in people when you say that. When’s the last time you properly obeyed a license when copyijg and pasting from Stack Overflow? When’s the last time you think the average dev did?
Also, no hard feelings about the presumptuous thing. Idk why I got defensive.
And as an aside, I think I’ve heard that in some jurisdictions there is no concept of public domain and in others you cannot willfully put things into it. So licenses like CC0 or the awfully named Unlicense are better alternatives. (Bad name because Unlicense and Unlicensed are so close in spelling but wildly different.)