To be clear, every place I have seen self-checkouts in my area, they have been optional. There's no "forcing customers to do unpaid work". Everyone who uses them is choosing to use them over the regular checkouts, which are staffed at roughly the same level they were a decade ago. They are also in one big bank, with between 1 and 3 (though usually 1) employees standing at an "operator" stand nearby, not "only 1 with an employee".

I am not saying there are no stores deliberately offloading work onto customers, but a) it's clearly not all stores, and b) I, at least, actively prefer using self-checkout, and do not care that it puts a negligible amount of work onto my shoulders.

And gee, thanks for moralizing at me about causing the downfall of society by (checks notes) not wanting to add to my introverted self's overall burden of stress by interacting pointlessly with strangers just in order to get the food I need to survive. Maybe (as I suggested in my first post here) don't assume that your experiences are universal?