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I don't think the connotation these days is particular negative, in the sense it's being used here. See, e.g., "viral video".

Politics aside, "copyleft" originates from a pun and is hardly self-explanatory, whereas "viral" is.

The word "left" is now very charged too, maybe even more than "viral".

Every word is charged now, so you might as well use it. "Copyleft" is a fine pun on "copyright".

Careful, or you'll get the copyleftists calling you a neo-libre-al.

they call everybody a nazi so by definition, they like living in a nazi country