They might have gotten away with this 30 years ago when HP inkjets were a premium machine that sold for $400-600. But they've spent 25 years giving them away for less than manufacturing cost and selling the cartridges at a markup. They've trained the public to believe inkjets are worth $36 to buy and own, not $36/month.

This is going to boomerang on them—hard.

https://arstechnica.com/gadgets/2024/02/hp-wants-you-to-pay-up-to-36-month-to-rent-a-printer-that-it-monitors/