Regarding the pineapple link, I'll be watching canned pineapple that I buy for where it is packed.
I love upside down cake, and pineapple is one of my favorite toppings for it.
I hear you, I make that a couple times of year.
I’m always as careful as possible when buying canned pineapple so not to get that tinny taste.
I try as often as possible to use fresh and frozen fruit and veggies vs. canned.