These have a designed in end-of-life.

Essentially a counter, that once it reaches zero, you have to ship your whole printer off (at super high expense) to replace a sponge inside the printer. Even if you open up your printer and clean it, there's no user way of resetting the counter.

Search for "Ecotank reset" for more details. But essentially they've priced the required maintenance at the cost of the printer, so the whole thing gets replaced after a certain number of cycles (and cycles aren't the same as pages, it will draw/dispose of ink every printer startup).