[stubish]

Absolutely nothing will prevent this. The situation is the same, and the same policing and laws about fraud and impersonation and 'enabling an underage person to...' will apply.

What is interesting is that checking physical ID places a burden on the bar. Bars get fined or worse if they do a poor job, or even just take the fall if the kids are more capable than the bouncers. With these attestations though, the government is takes responsibility. The connection is attested by gov to be legal, the gov can't turn around and claim it was illegal. They can't go after you, just the person who enabled the fraud.