Once your face is scanned it is disseminated to several databases both Federal and State, which can be leaky. It can be passed around law enforcement circles, used on mesh camera networks to record movements in public (China is an example) and potentially used against you in ways you might not be aware of yet. The Chinese via tiktok and other sources such as hacking, are building dossiers on every American citizen they can get their hands on. The “it’s easy and I’ve got nothing to hide” rationale is what they’re banking on, makes their job really simple. Hell, people take fucking selfies and post them along with their name in the clear on the internet all time, those posts are scraped for security data and identity.