You know what the alternatives are, right? either we have two mouths, or we speak with our nostrils and the silent, gaping hole below only unhinges for the consumption of organic matter.

Not that this makes it "wrong" but aluminum cans are also plastic cans, they have a liner on the inside of the metal layer that prevents the acidic soda from corroding things and affecting the flavor. Here's a quick demo of it. While it doesn't prevent the Al from being recycled it is single-use plastic, the liner burns off when the can is melted down. Glass has no such need for the liner.

Let's say an elected official or candidate (bless em if any would actually do this) says this phrase in a speech. Would they be arrested? Or would they be given an interview for them to explain themselves, where they deftly state "obviously I'm not talking about doing it myself - but generally speaking these companies are heading in a concerning direction". There would be debates over it, some people would be upset, but the story would fade and the politician would likely move on as well.

Say that phrase with Trump's voice in your head and it sounds like much of his political speech.

Regular folks must be a lot more careful with their speech in the US, far less of it is free.

To further add some numbers (and their source) to this, the average grocery cashier makes $15-16 an hour, or liberally $35k a year. Note that this isn't the entire cost of a cashier, the checkout equipment and POS systems cost money too - let's assume that and the automatic checkout system are in the same order of magnitude. There were about 800k grocery store cashiers in the US in 2017 (source) so that's about $28 billion, or ~3% of that proposed $1T revenue.

Many factors not included in this calc, more importantly regional variations in costs. Food prices and wages are higher than average in NY, 10% might not be pretty well calculated for that state. Also, human employees must be insured/have benefits, and machines do not require this. That cost savings on stores isn't in the calculus here.

Also a huge fan of holding food chains accountable for fair pricing. Hope this becomes effective!