There was a time (a few weeks/months, I think?) when I've been getting that "imgur is over capacity, try again later" every time I tried to open an image posted there. First few times I wondered if imgur is really down, but haven't seen anyone in related comment sections complain, eventually I figured out that they are just lying to you with a fake error message if they don't like your IP for whatever reason, and the situation made me really angry (just return a 403 and say that the address is banned, damn it! It helps nobody to give a wrong error message and googling it just shows that many people have the same problem, scrapers will not be fooled by that anyway). After a while, I stopped getting those errors.