Often enough that it is mentioned in the article.

Carve-outs in general are mentioned in the article. A common type of carve-out: the employee retention pool. The article does not say that founder carve-outs are common. I'm sure they've happened, but you said they happen "often", as a way to get founders to greenlight deals. Do you know how often that happens?

I don't know how often that happens, so I can't add anything to that part of the discussion.

I can only reason that it depends on whether the founder still has voting control of the company, but that's implied with "greenlighting".

WeWork is a similar situation where the founder is effectively getting a carve-out to greenlight the deal. That's only one example, though.