Your implication, that this aspect of Torvalds' interpersonal style is vindicated by Linux' success, is a classic Halo effect. Post hoc ergo propter hoc.

I'm answering your question: maybe that's how he measures its success.

So your suggestion here is that Torvalds has some monthly 'Linux success' metrics and varies the amount and style of swearing based on those.

It'd certainly make a good sitcom.