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This article is just an ad for Revelio Labs. I don’t trust the conclusion. Very little info on methodology

I think the whole reason articles like this are common is that one can easily calculate these numbers from visa statistics, i.e. number of people who didn't get a job within the grace period. Naturally these kinds of statistics can be a bit off, for example someone might transition to another type of visa instead of seeking work.

H-1B data is available for public view.