Do they scan it with a call to the cloud to verify it? That's the real threat here - continuous tracking, ability to turn it off or geo fence you to a certain area.
ID scans at bars have been normal for at least decade. Have you really never had your ID scanned? I find that hard to believe.
I hate it. There's no good reason to scan my ID when I'm very obviously of legal age. Some of the bars do this for tracking data and to sell your personal info. Some of the bars are lazy and it's a relatively straightforward way to validate your card.
There's a good reason to validate that I have a vaccine, though, because my presence there affects the life of the staff and other customers. I'm not giving up freedom here, because it's not my freedom to put others at risk, and they shouldn't have the freedom to put mine at risk.
Your slippery slope arguments are also really bad. You can already be (and already are) tracked by your cell phone at all times. We don't need vaccine checks to do it. If the scary government was going to come get you, they have more than enough at their disposal currently to do it.
All of those kinds of transactions are voluntary with anonymous alternatives except for flying. This will become a scanable thing because if it doesn't it won't be a workable system.
BTW I'm opposed to scanning for flying too. No fly lists are an example that came out of this practice. They'll do the same with this new system - no go lists for those with a low enough social credit score.
