Hi, I'm trying to link my gog wishlist to razer cortex, it asks me for my gog username but then it says "Permission to import not granted. Please change your store account privacy setting to public."

How do I do this? I tried changing my wishlist setting to everyone but it hasn't made a difference.

Give it more time perhaps.
Your wishlist is definitely set to public.

Yep I see your wishlist too, so give it a day or so.

"Please change your store account privacy setting to public." may not be referring to changing my wishlist to public. What else could it mean?

I don't think there is such a thing here..
All the privacy settings you can find under https://www.gog.com/account/settings/privacy

Early sign that GOG's webmonkeys are working on getting a user profile system in place behind the scenes?

I think it was announced about a year ago or so, not a very big secret : )

Didn't say it was. :) But I don't think they ever really have "announced" it or talked much about it (not recently, to be sure), just mentioned it offhandedly in one or two out-of-the-way places. Pretty sure no ETA has ever been stated, either.

Public account? Maybe they want to contact you via chat. Go to Account -> Orders and Settings -> Privacy and enable:

1. Friends & Chat -> Allow conversations with -> Choose "anyone"
2. Searching for me -> Enable "Users are able to search for me by email or username"
3. Wishlist -> Share wishlist with -> Choose "everyone"
4. Refresh your account.

I think there was an official blue post about the future..
Can't find it though, not a big surprise either ; )