Doesn't need to be publishers as such either. Over at
https://dbnl.org/, for example, you'll find a fair amount of texts that were OCR-ed a few decades ago. The biggest tell is e/c/o confusion.
Given that a fair number of the texts I'm referring to are in Middle Dutch, where spelling was quite variable, it can sometimes be more confusing than you might expect. (Of course the OCR was done on paper editions of the original manuscripts from within the past century or two; OCR-ing the original manuscripts with such minor mistakes would be quite a feat!)
I hasten to add that they provide a very valuable service. Don't take any of this negatively. It's just a minor beauty flaw.