the steam downloaders work on the SteamCMD principle (or the donated file kind too for restricted games) and kemono is just an archiver.
There isn’t a point for anyone to make such a tool as the website is literally FREE to use and it would be a waste of money to re-host already free content.
Honestly just suck it up and make an account, you won’t be tracked down by the CIA, the FBI isnt going to come knocking at your door either just because you wanted to download Dagoth Ur loincloth replacement mod.