It's especially true now that the big media players are finally waking up to affiliate marketing (NYTime buying WireCutter and SweetHome) and BestReviews (which was already an epic product review site in it's self due to the fact they built their own 10,000 sq ft testing lab) being acquired by Tronc (owns the LA Times and half a dozen more publications).
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Amazon basically accepts everyone who can get verified by phone. You need a website, YouTube channel or mobile application to list when you register. You will be on a kind of probation. You have 180 days to make 3 sales. After those sales your website will be reviewed for compliance. Here’s a list of things that the will check and a sample affiliate disclosure.
Affiliate networks offer you access to multiple (and by multiple, we mean hundreds if not thousands) of individual affiliate programs. They basically work by simplifying the signup process - instead of applying to become an affiliate for a each product you want to promote, you simply apply to join the network and instantly have access to hundreds of different affiliate offers.