I think you miss the thrust of the original argument. No one, especially not the author of the blog, argued that there was a legal requirement. The point here

I think you miss the thrust of the original argument. No one, especially not the author of the blog, argued that there was a legal requirement. The point here is that the founders arguably got to their position because people entrusted them with services. To defend the blatant disregard for users is to attack the very thing that enabled the exit in the first place.