It's because of the subscription based ink which has hardware and cloud based DRM(!). HP even warns about it when you cancel the subscription (in small print a

It's because of the subscription based ink which has hardware and cloud based DRM(!). HP even warns about it when you cancel the subscription (in small print and legalese, though), which is free for the first 12 months after purchasing a printer or so I believe. I know because my parents have a HP printer (probably also the last because of these shenanigans) and I had to throw away a full set of ink because they cancelled the subscription (cost is way too high for the amount of prints being made). They didn't understand at all why the printer refused the supplied ink, even after I tried to explain it.