It could be organizations in the US itself. I remember somewhere that the military was still requriing 3.5 floppies at least within the last 5 years. (no, I'm not talking about the nuke software that uses the bigger floppies)
If you dont need the extra capacity or speed that USB or optical offers you, don't upgrade. I mean this specifically for infrastructure-size projects where the "thing" / entity that is controlled costs multiple orders of magnitude more than the computer system controlling it. Say I have a hydro-electric dam, or any kind of power plant (not just nuke), or train switch controller, submarine, aircraft carrier, etc. Stuff that can't break. Its just cheaper and safer to keep using the same tech, keep replacing known-working parts, than it is to risk updating the system to "stay current", and risk a costly outage (or some kind of catastrophe, even if theres only a 10^-7 chance of it happening). I dont blame them one bit.
OTOH, the only way to actually preserve data is to keep rolling them forward to new physical media as the old ones die off (this is of course abstracted away in cloud solutions).