Yes, that ended with No Public Domain and no "Found Photos".

Hasn't hurt the uploads any, has it?
EM every agency makes it's own rules, most have nothing to do with the actual laws. So if you are looking for what "most" agencies require, I'd suggest you start with the ones you work for, or wish to, and treat each individually. There is no "MOST". Just like pay, levels, commissions, partners and reviews, it is different and often changing.
and rules will vary by agency, and time -- eg ss no longer allows scans of vintage maps, etc