Because a trademark is a brand name that modifies a generic noun. For example, LEGO building bricks are different from Mega Blok building bricks, though they’re both types of building bricks. Now, in casual use, trademarks get used by themselves as a shortened version of the trademark-noun combo (e.g. “Have you driven a Ford lately?” for Ford automobiles), and taken to the extreme that results in the trademark actually becoming a noun and losing its protected status, a genericized trademark (which contrary to popular belief, Jell-O and Kleenex are not quite yet). But it’s silly to argue that there’s a “correct” way to make a trademark-used-as-a-noun plural, when it’s technically not correct to use a trademark as a noun in the first place.
https://www.google.com/m?q=trademark+noun+adjective
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