Hope this case won't be used against consumers in the future. If I want to use/make an extension that scrubs all affiliate links and cookies that should be legal, same with an extension that replaces all affiliate links/cookies with ones from someone I want to support. Advertisers and their partners have no rights to anything being stored/done on my devices.
Not defending what Paypal was doing, but the real issue for me is that they had no intention of actually finding the best codes/discounts, not what they did with affiliate links.