[ppog]

That's fine for US citizens entering the US, but any 'travel mode' needs to work for the outbound trip too. If the country you're visiting has adopted a US-style border stance, then you're in no better a position than a non-US citizen visiting the US: the border forces of that other country can detain you until travel mode expires if they want. It seems like "They can't hold me for days while they wait for the mode to expire" only works for citizens returning to their own countries.

[pseudalopex]

More likely they'd just send you home. Either way, denying people entry is bad for business and tourism. If enough people want to protect their accounts when they travel, countries will have to weigh the trade-offs.

[TuringNYC]

Sure, it is bad for business. It will likely be used disproportionately on brown people and minorities, just like "random" screenings at the airport. Yes, bad for tourism, but only consistently bad for a minority of the population and most others just have to take of their shoes etc.