I was looking at the following MSE question Is There An Injective Cubic Polynomial $\mathbb Z^2 \rightarrow \mathbb Z$? (a popular 76 upvote, 100 bonus at present) and after a related google search I noticed the same problem (obviously copied as far as I could tell) was posted at another web site http://www.helptouser.com/mathematics/1073961-is-there-an-injective-cubic-polynomial-mathbb-z2-rightarrow-mathbb-z.html
I wonder if that website is affiliated in any way with MSE and if they copied the problem with MSE knowledge and approval. (Formally I can't rule out that the MSE OP @MiloBrandt posted their question over there to get more answers, so in that case I should not think the problem was "copied", with or without approval. I would think that if MSE users would like to post their questions at more than one website to promote them, then that should be fine, but what if other websites copy questions/answers without asking for permission, does that happen, is this the case with the above question, is it ok?) My guess is that MSE moderators are perhaps aware of that website (and other such websites?), so if I see it available online then it must be ok. Or perhaps it is not is ok? Shall we be upset that they "steal" from MSE (did they ask for a permission, do they have the right to do it anyway), or shall we be happy that they promote and "distribute" math to a larger potential audience. Does MSE have an obligation (as part of the larger SE) to allow content to be distributed to other websites. I hope it was ok to state several (and perhaps a bit vague) questions here, any general comments are welcome, I am just curious if there is any accepted policy or norms on this (and if MSE has a means to deal with this problem, if it is indeed a problem).