I haven't seen these in California. But I wouldn't mind allowing my ID to be scanned if asked; I don't have an SO to worry about finding out so not a blackmail target. And I like the idea that it might reduce the potential for a 2AM'er. I'm also not worried about the Club giving my info to LE. If I'm going to get caught in an ITC raid, that info won't matter one way or the other. And if the club sells my data, that's a risk, but it's also illegal and if proved, the club faces significant consequences.
But I absolutely WILL NOT use a card for any purchases in that club. Just like I don't use my card now without such ID scans. I developed the discipline needed to ensure I never spend over my allocated cash in a club a long time ago.
Interesting story about cops showing up at my house: Earlier this year, I was hosting an A-List porn star at my home for one of our Sugar dates. About 15 minutes after she arrived, before we had started anything salacious, there's knock at my door. It was a local PD officer investigating a stolen car that had been abandoned and parked at the curb across the street from my home. The cops had canvassed the block for witnesses and this guy noticed my Ring camera. He asked me if I could review the cam video for any footage of the perp. I told him I'd check and he gave me an email address to send whatever I could find.
Now my popular porn star Sugar date heard the entire conversation, though she stayed out of sight of the door. Obviously, she did not want video of her walking into my home to be provided to LAPD detectives! She had no doubt that eventually she would be recognized. Nor did she want any video of her car parked in front of my house to be sent either. So we went into my home office and reviewed the video together. Eventually I produced a carefully edited clip that showed ONLY the stolen car and the perp, and she was ok with me sending it to the cops. But I was lucky that she was cool about the whole thing. That could have gone south in a hurry. So why did I tell this story? Humble Brag? Partially. But also to point out that your ID data is just data. They key issue with having your ID swiped is really about what the club will DO with the data.