It's not Hotjar specifically trying to grab tax returns, true, but if Hotjar is using the data sent to it for its own purposes, then it doesn't actually matter if they intended to get tax returns specifically or not. They're still doing wrong.
I don't know. But they certainly obtained it, and it would be out of character for Meta not to capitalize on it. I think the assumption they used it is a reasonable one, given their history.
I disagree, especially when half the stories are like this one, and only exist because of all the other stories supporting them, so this one must be true.
