There's been a discussion in the past about URL shorteners, and I've argued that they're actually not that evil, given that sometimes they're the only way to link to the more obscure URI schemas (
There are, however, even eviler places in the internet that allow you to "make money" (somehow) by "brokering" links.
Now, if I make a .zip file with my super awesome thingadongdong calculating spreadsheet (updated to version 5.9f21 of Thingadongdongingfierfest SE+) and put a paywall in front of it so that I can get some money back from it... it's my choice. It wouldn't be right for us to skip this paywall and offer the direct link straight away. So we can't outright ban such services - adfly is e.g. commonly used by the Minecraft modding community as a legitimate paper-thin paywall.
However, what we actually got today is just a good ole referral program where people are encouraged to spam about a service and get a split (or whatever else) out of every purchase going through their link; all of this wrapped into some clickbank spamming operation thingadongdong. I replaced the affiliate link with its actual destination with extreme prejudice.
How do we balance the goods and evils of this?