HP is very insistent that users of its printers don't turn to cheaper third-party alternatives for their ink cartridges. It introduced a feature called Dynamic Security in...
To the downvoters, I mean this in a factual sense, since HP sells printers ar a loss, which is a sort of investment, since they sell the ink at a high markup to recoup their costs and earn money.
So if customers buy their cheap printer, but not their expensive ink, then the investment HP made in the customer is a bad investment for HP.
It's a bad investment because it's unethical and people care about this sort of stuff (especially when every company under the sun is trying to replicate HP's vampiric nature).