the graph is clearly just fitted to the data

That’s the problem. It’s heavily skewed when compared to the greater overall engagement statistics.

When did this happen?

I agree

As someone who sells both the ecotanks are good, but you dont quite get the yield they promise upfront.

Because the ink has to travel all the way from the reservoir at the front of the printer to the print head, there is much more distance that the ink has to travel, giving it more opportunity to dry out. To combat this, ecotanks need to purge much more frequently than traditional inkjets that mount the cartridges next to the print head. This requires shooting a lot of the ink through the lines at high speed/pressure in turn wasting ink.

Also, once this cleaning cycle has been run enough times, you need to replace the ink pad that absorbs all the ink used to clean out the printer. (Only costs 10 bucks)

All of this said, I still recommend them to folks who need to print photos at home, as their color accuracy is impressive for a CMYK printer, and while the yield isn’t as high as they claim, it is still much cheaper per page than most other inkjets. But more often than not, I try to convince people to just get a monochrome Brother and use a printing service/shop that has a multi-thousand dollar photo printer when they need photos.