This is fascinating and it parallels sentiment in the photography world. Personally, I’m not sure this stance is right for everyone but it’s certainly right for some, especially well established graphic designers and artists who aren’t groping for exposure.
My problem with it is this: a beginning photographer (or artist) might feel the need to bootstrap exposure and may not be so secure in the quality of his or her work. Taking advantage of a few opportunities to show work to a wider audience, with citation and without pay, can lead to more exposure, confidence, more work, and in the end, money.
This other side is like a beginning photographer going crazy watermarking his work and being overly concerned with theft before the work is mature and before the work is stolen.
So, it’s complicated and one size doesn’t fit all.