[r00fus]

It's likely Amazon. Of course, there are instances where (e.g. mason jars) where fakes may be acceptable as they're commodity products.

It's tiring using Fakespot just to find dozens of D and Fs. For the most part, I use other retailers or just don't buy the item (surprisingly it's a zen option to not buy stuff you don't pressingly need).

[JasonFruit]

They really aren't acceptable, though; they are often not really suitable for pressure canning, and the failure and breakage rate is higher.