The world has changed where we have digitized almost everything that can be a virtual product or service so it is not surprising that digital money have their own digital affiliate programs.
Even though affiliate marketing has been around for some years the use of referral marketing to promote digital currencies and exchanges is relatively new. I don't think anyone is complaining about it because having new products to add to our portfolio is never a bad thing. However, I understand it when I hear that some marketing professionals are skeptical about crypto money in the first place and find it a bit scary about getting involved.