I dont think this is limited to printers though… I bought a nice hp convertible laptop for uni. Now the pen tips that came with it are used up and the only way to get new ones is to buy 110 tips for about 100€ (which are very hard to get too) or to buy a new pen for 40€. I tried contacting hp support where I first had to fight through a “chat bot” (basically a fancy way to navigate through their faq) to finally be told that my warranty is voided for 2 months now and if I wanted to contact hp support I might have to pay fees on their hotline … Printers are worse for sure though but I will never in my life again buy any product made by HP.

Edit: to be clear 100 tips for over 100€ is insane and you can basically only get them from aliexpress and they are not even sold in the official hp shop.