> Even if it's just 1 or 2% or even a trace amount, they're checking off boxes identifying themselves as multiracial.

This is not necessarily wrong though. In many cases I've seen where children of grandparents from a particular region showing up on those products as having low percentage heritage from those areas.

If your grandmother was born in China and is - for all intents and purposes - clearly Chinese, yet you show up with 3% Chinese DNA on these products, does that mean you can't identify as having Chinese in your family background? Who determines where this line is drawn?