That's a good example. That people will buy them unknowingly. But we can avoid that by informing.

I don't think any brand willingly put bad capacitors in just so that their products can self-destroy though?

I think this actually is at least semi-conscious/willing. Better capacitors cost a few cents more, but not that much more. But if the equipment is discarded after a few years, perhaps the manufacturer can sell a new one.

Just recently observed this in a ten-year-old Viewsonic LCD monitor: the power supply capacitors needed to be changed, then it was OK again. It's a relatively simple repair operation if you know how to solder.