It's an attempt on intimidation, because supposedly for the person travelling it's a lose-lose:
provide all your data, and allow the US government (and any connected entities (big tech)) to use it to track and sell that data
don't provide all your data, and when the US government suspects that you did that, they can bar entry for little reason, and/or have legal grounds(/excuse) for go after you
All around it's a humiliation and intimidation exercise
It's an attempt on intimidation, because supposedly for the person travelling it's a lose-lose:
All around it's a humiliation and intimidation exercise