UPS and American companies in general
But this is USPS, which isn’t an American company, it’s a US independent agency.
Their mandate isn’t (AFAIK…) to make a profit, but rather to serve the mail requirements of a very large country.
Personally, my experiences with USPS have been generally positive, from passports for infants to free change-of-address forwarding service to tracking down quasi-scam products from Amazon. YMMV though.
I’m pretty sure that’s exactly why referring to women as “females” is problematic — using male/female as nouns is fine for animals. Humans, not so much…