SD cards in phones

Parallel to 1., there's also still a chance of getting a counterfit card, especially if you buy from some third-party seller on Amazon or somesuch. Such an SD card will look like a genuine x GB card, report itself as such, but in actually have only a few GB (or even just MB) of actual storage that loops. So you're soon overwriting your own data.

I actually put such a card into my previous, cheaper phone, when I got it, several years ago. You'll see all sorts of weird errors then.