I don't want to give them any tips but they could allow 3rd party ink but then intentionally make the printer spew the ink around in smudges and with color stre

I don't want to give them any tips but they could allow 3rd party ink but then intentionally make the printer spew the ink around in smudges and with color streaks etc when it think the ink is 3rd party. This would ruin the reputation of 3rd party ink and make people "learn" that they have to buy branded ink to get acceptable prints.