I think this is more difficult since many people have the paperless option, so no bill arrives in the mail! Sure, it might be on their email, but if their email is related to a paid service (microsoft, comcast, verizon, protonmail, etc) and the bill doesn’t get paid, then the email service will be gone as well as access to any email notifications of billing!!
So, right now I have most (not all) of my billing notifications, etc. on a free webmail. Of course I have written instructions, too. But imagine if someone didn’t leave instructions and no bills arrived in UPSP mail… what a mess!