Well I've figured out what does and doesn't work with JD2. It's partly my bad luck hitting a non-working link on the random first link I tried, but yeah, there are indeed some links that after getting through the adfly bullshit, land on a link protector page with a captcha scheme that JD2 can't solve. These links are doubly worthless, I clicked my way through one and onto that link protector. That link protector had 30-40 links on it, it did not tell me the filenames of any of the links, it required me to click on each link to pop them open in a new tab, and each click had a 75% chance spawning a popup or forwarding the page to an ad. When the page forwards I have to back up the browser to that hard to get to page, and it drops me at the top of the page with no real way to tell where I left off. Literally a fucking nightmare that'd require literally hundreds of clicks just to harvest links for one game. I made a slight effort to try too, and accidentally closed the tab while trying to manage all the tabs it was spawning
Thankfully the error JD2 shows when it hits that site is pretty obvious, so I can just ignore it, and move onto links JD2 can manage.