When you buy a cheap computer printer, you can sometimes get it for free after the rebate. Why would a firm sell you something for a zero price? (The answer isn't that it wants to be nice.)
Its not free for use but free for the product only, to use that printer we need ink and printer cartridges and some particular parts that are sold only by that firms, these extra parts are very costly most of the time because it includes the price of the printer, i.e. instead of taking the price of the printer in one go the company is taking it bit by bit wherever we are buying those goods related to that printer.
its like a free game that charges money to shoot enemy.
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