Because it's mostly terrible advice. Here's a small sample:
It's 2020 people.
How many people know how to write a formula in Excel. I spend most of my days programming and all I can recall is that they start with '='.
Seriously, no one knows how to build a spreadsheet complicated enough to automate the process of splitting house bills.
A little better.
BUT, have you tried reminding your housemates to settle the amount they owe you? It's probably easier to teach me how to write without cap locks, and that's NOT EASY.
It's not your housemate's fault though, there are 99 million things to do every day but paying you back $20 for the last internet bill ain't one.
I won't even waste my time on this one.
Shameless plug incoming.
Seriously, I've lived in over 10 shared houses in my short time on earth. I decided to spend the last 3 years solving the most annoying problem that plagued all of them. Housemates having to owe each other money.
I co-founded YSplit with 2 of my closest and smartest friends and I'm happy to see how it has positively benefited hundreds of users so far.
It's simple really.
That's it! Every month when your bills are due, YSplit automatically bills everyone their share. So you can kiss goodbye to I.O.U's.
That's how you split HBO Now with your housemates.