I've got three different Google accounts each associated with its own domain name, all set up a long time ago when the service was called Google Apps. I only use each for sending and receiving email from addresses at those domains.
One of the accounts is now nagging me to add payment information for my "Google Workspace Business Starter subscription", but the other two accounts aren't doing this at all.
I'm not aware of having set up anything different between the accounts, so why might I have to start paying for one of them but not the other two? And is there anything I can do to make the one like the other two so I can continue using it for free email?
