[kibibu]

I genuinely don't think Malbolge, for example, warrants a Wikipedia page if Odin doesn't

[fluoridation]

Malbolge is basically a meme, and Wikipedia does have articles for memes. Speaking for myself, I have heard about Malbolge, and not about Odin.

[JBits]

Perhaps it is because Malbolge is notable within the category of esolangs.

[lifthrasiir]

As an actual esolang enthusiast (and a past Wikipedia administrator two decades ago), I can say that Malbolge is only notable because it remained unsolved for the extended period only due to the lack of serious attempts. It doesn't even pass the meme criteria IMO.

[dickiedyce]

Although, didn’t it appear in a popular culture reference? I seem to remember an episode of “elementary“ that mentioned it.

[lifthrasiir]

Oh, sure, the "In Popular Culture" section is a prerequisite for every Wikipedia article. ;-)

In seriousness though, the Malbolge article (2003) significantly predates the TV series in question (2012--2019). I wouldn't be surprised that writers got the info from Wikipedia.

[HappyPanacea]

A form of Citogenesis although here it is about notability instead (notabilitogensesis is mouthful unfortunately)