Unless you live alone and have no family, there are all sorts of scenarios for sharing passwords.
Fedex/UPS only lets one account get detailed tracking numbers for an address, so I need to share my Fedex account. To check and pay my freeway tolls I'm only allowed a single account - so it gets shared. Plenty of people share all sorts of subscriptions, be they to Netflix, the New Yorker, or more. I need to share access to my insurance, to the utility bills, to sporting event tickets, to grocery store and pet food orders. On and on and on.
Also, for many of my accounts today, I use "Sign in with Google" so it's not even possible for me to share a password or credentials unless I share my whole Google account shebang.
Fedex/UPS only lets one account get detailed tracking numbers for an address, so I need to share my Fedex account. To check and pay my freeway tolls I'm only allowed a single account - so it gets shared. Plenty of people share all sorts of subscriptions, be they to Netflix, the New Yorker, or more. I need to share access to my insurance, to the utility bills, to sporting event tickets, to grocery store and pet food orders. On and on and on.