Again, this is not valid advice for non-citizens. If you're a citizen, sure, feel free to go through with an empty or password-protected device. Maybe you'll be detained for a while, inconvenienced, given a stern talking to, etc.

If you're not a citizen? You can be denied for literally anything the agent feels like. They feel you're suspicious because you claim (falsely or not) you don't have a facebook account? You're not coming in. Visa denied.

yup. cbp officers can deny your entry if they think blond hair is ugly.

> Visa denied.

you know what's shitty? i have a b1/b2 visa. cost me 100 usd and two working days. i also visited the us ~6 times, never overstayed by an hour. but even then, i'm suspicious because i'm brazilian (that's a theory, of course. i have no proof other than brazilian friends also having problems with cbp).

What you are describing is not the result of yourself protecting your privacy but the result of being found to be suspicious.

Not appearing suspicious is an important part of protecting your privacy. While it's true that acting stupid or careless can bring you in trouble this is not sufficient to deny the utility of privacy enhancing behavior.