If you received an illegal subpoena from the government you wouldn’t have any costs associated with it at all? Just throw it in the trash, move on with your day, and surely you will never have to think about it again?
It’s not an “illegal” subpoena, police can try and ask whatever they want, but I’m assuming there’s no penalties for ignoring.
But I asked a question, maybe there are exceptions and you must respond anyway despite lack of warrant.
While there could be reasons considered valid to respond to an informal request (some urgent life/safety matter), the police can and do lie, but are less likely to do so to a judge.
Lived in a building once where management agreed to police installed warrantless spycams in some hallways and told management it was to investigate a car theft ring, but it was some guy (edit:) storing drugs and keeping to themself.
Sadly, I don’t think there’s any kind of post-review of urgent informal requests to assess validity/accuracy of the request with consequences.
Also, like the article explains, it is possibly illegal for them to send this warrantless subpoenas. Further, they are not simply "asking," as you describe - the text of the subpoena starts off "We command you," and ends with the explicit threat of legal action if twitter fails to comply.
Cooperation obtained under false pretences may be fraud.
Privacy laws exist, with exceptions for illegal behavior. It may well be illegal to give data to cops unless you have user permission or a warrant (IANAL).
It's not the cameras that GP is complaining about, it is the lack of warrant.