They know the name of the individual who recorded it and transmitted it to Twitter. They can go after her if there is a law and hopefully have a real punishment in place for this kind of behavior.
Furthermore the individual who recorded it also profited off it. She has a career that depends on how much exposure she gets and this is apparently the biggest thing she's done. She was also offered something by Alaska Airlines (their tweet was deleted), tried to get a Buzzfeed job from the attention, sent out some tweet about getting free plane tickets from her followers, and increased her exposure even more via the tons of new followers she gained.
They're trying to maximize user engagement/addiction and it's working. But what cost is their algorithm imposing on society? We're seeing more outrage in politics, more clickbait in journalism, and more privacy violations like this. Engagement-obsessed algorithms have created massive externalities which we all pay for.
Ok, let's add an exception for really obvious cases. What if you are taken to trial and later found not guilty (despite my recording being used as evidence against you). Can you sue me now?
You can see how deep the rabbit hole goes. Beware unintended consequences. If you're in a public place then I have every right to record you.
But what about hearing aids and vision assistance devices? Does HoloLens become impossible without consent from everyone?