Nope:

> will pay €0.50 for each first annual install per year over a 1 million threshold

EDIT: I misread, I thought they were arguing that the 50c was per month, not the total number at the end of the calculation.

Yes. The calculator shows a monthly amount assuming you get your annual-user-device-install spread evenly over the year. It should be showing the annual cost as the total and as a convenience show the average monthly cost.