One reason could be that it makes the post start with three implicit upvotes because you know there are at least three other people who like this idea.

Labels would be better but US producers aren't going to label their products voluntarily are they.

It's a great way to communicate foreign products to other shoppers and remind people that buying local is still important after the news cycle moves on.

It may be somewhat inconvenient for employees but that will financially inconvenience employers and encourage them to discontinue more foreign product lines.

Labels are not always sufficient. Labels for Country of Origin or Made in Europe (or China) can still mean that the profits go to USA, would for me also be a reason to look for alternatives.

Write your regultors, ask them to make the country of orientation a mandatory labeling requirement. Make it big and obvious.

Many of my local stores are using red maple leafs and changing the barcode names to indicate Canadian made products.

Many larger places have replaced the paper tag with an eink display these days, it's actually hard to notice it's not paper unless you look closely

FWIW I worked in a supermarket. Go nuts, nobody cares. My asshole manager would make me keep moving everything anyways, and I later learned this was to prevent customers from easily finding the things they wanted.

Wasting company time hurt the company, not me. I didn't mind collecting shopping carts either. My friends weren't waiting for me to get off work because the shifts were irregular anyways.

I didn't even care about stuff that risked the store shutting down, because nobody intends to work at a grocery store for very long. Nothing hurt my pay because it was already minimum wage. Go ahead and steal, I sure wasn't paid to care.

Well at least he will get paid for extra time right?

...

Right?