I don't think its unreasonable to be upset at what Cuban did here. People just want to go back to normal without a billionaire's hired snitch at the table next to them.
Cuban didn’t call out any businesses by name; it was a completely anonymous survey. But if your business is flouting safety expectations you should expect that eventually some customers are going to call you out publicly, with photos, videos etc as supporting evidence.
Mark Cuban did these businesses a favor, if they listen.
Even if they had publicly made themselves known, which they should have, you can't seriously argue that what Cuban did wasn't invasive.