I agree with the thrust of your comment, but the bit about "clickbait" is misplaced.

Is is clearly a poetic metaphor - no-one clicking on the article seriously believed that Wikipedia has a literal biological cancer (the "cancer" metaphor is hardly a new one, if any criticism can be made here it would be that it is almost verging on cliche). Indeed the entire article is structured around this metaphor - the title is hardly false advertising.

I disagree strongly with this new obsession that every article title and headline must be written as pure "Man Bites Dog" factual summary, particularly for opinion pieces like this. Surely there is room for some attempt at poetic flair.

(A hypothetical example of a real "clickbait" style headline for this article might be "Google Will Buy Wikipedia").