You can beat the Magnuson-Moss drum all you want, but it's empty keybaord dribble at this point. For someone who's a member of this forum perhaps you've missed what is probably HUNDREDS of threads over the years confirming the fact that modifying an Apple machine past the Apple intended design VOIDS the warranty. Or perhaps you also missed the prominent retailers like iFixit, MacSales, and prominent tech reviewers who have all confirmed this COUNTLESS times in their product information and reviews.
From MacSales:
Unfortunately though, there exists a misconception among some users and even technicians that opening the machine voids the warranty.
We address this topic directly with customers via our support portals and are happy to inform you here of the same fact: upgrading your Mac does not void its warranty.
This consumer protection is owed to the little known Magnuson-Moss Warranty Act of 1975. Put simply, the act states that a company can’t require you to upgrade with only its own branded parts to retain the warranty. This important act protects your rights as a consumer and allows you to install upgrades with peace of mind confidence.