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Catbox does appear to block Tor connections. They simply time out (I just tried). I'm gonna go out on a limb and say they have the same problem a bunch of other free image hosts have had; degenerate faggots using them to host cheese pizza, either for their personal use, or as an excuse to report the site and get it taken down because it's used by "chuds."

Unfortunately, the only surefire way to mitigate a lot of that is to block Tor connections. The degenerates don't like having their real IP exposed so it tends to keep them away. It's not an ideal method, as it does block a lot of legitimate users, but unfortunately that's the way it has to be for now. You have kikes to thank for that. They've realized that the quickest way to shut down speech they don't like is to flood it with cheese pizza. Especially because when that happens, nobody even asks "why do these miscreants even have the stuff to flood with in the first place?"

As to not being able to reach it on clearnet, that's 100% a DNS issue. Most ISP blocks are at the DNS level, and if you don't use their DNS, you don't have a problem. Comcast/Xfinity might block via their "Enhanced Security Suite", but that's only if you use their equipment. Use your own modem (which they have to allow) and they can't do shit. And they'll probably even warn you that it's "less secure", but that just means "we can't block enough wrongthink."

Source: Former Comcast customer who ran his own equipment and DNS, and never had an issue with goats posting catbox links.

Every tutorial I follow to stop my dns does not work to allow catbox.