Barry Watzman wrote:

That is simply not true.

Some inkjet printers have the printhead in the consumable, others have
permanent printheads, the consumable is just an "ink tank" and there are
tubes from the tank to the permanent printhead.

A manufacturer has every right to rightfully void the warranty of a
printer with permanent printheads that are genuinely destroyed by a 3rd
party ink, and they do it.

I'd like you to name just one documented case where the printhead was
deemed to have been destroyed by after market ink and was confirmed by
lab analysis (independent lab of course). Simply telling someone over
the phone that their printhead was destroyed by after market ink and
that their warranty was thus voided is simply a market ploy and it's
success depends on the gullibility of the consumer.
Frank