在「FTC Warns Companies ‘Warranty Void if Removed’ Stickers Are Flatly Illegal」這邊看到的新聞。FTC 的新聞稿則可以在「FTC Staff Warns Companies that It Is Illegal to Condition Warranty Coverage on the Use of Specified Parts or Services」這邊看到。
The law does not require any product to have a warranty (it may be sold "as is"), but if it does have a warranty, the warranty must comply with this law. The law was created to fix problems as a result of manufacturers using disclaimers on warranties in an unfair or misleading manner.
其中這段條文讓 FTC 認為「拆封喪失保固」違法：
(c) No Warrantor of a consumer product may condition his written or implied warranty of such product on the consumer's using, in connection with such product, any article or service (other than article or service provided without charge under the terms of the warranty) which is identified by brand, trade, or corporate name; except that the prohibition of this subsection may be waived by the Commission if—
(1) the warrantor satisfies the Commission that the warranted product will function properly only if the article or service so identified is used in connection with the warranted product, and
(2) the Commission finds that such a waiver is in the public interest.
“The use of [company name] parts is required to keep your… manufacturer’s warranties and any extended warranties intact.” = Hyundai.
“This warranty shall not apply if this product… is used with products not sold or licensed by” = Nintendo.
“This warranty does not apply if this product… has had the warranty seal on the [product] altered, defaced, or removed” = Sony.
不過在另外一邊，Reddit 上 Nintendo 區的討論也蠻有趣的：「FTC Staff Warns Companies that it is Illegal to Condition Warranty Coverage on the Use of Specified Parts or Services : nintendo」，裡面就稍微扯遠了一些，提到了改機之類的保固問題...
另外值得一提的是，同一家媒體在 2016 年的時候就有報導類似的事情了，不過看起來當時沒什麼改善：「Microsoft, Sony, and other companies still use illegal warranty-void-if-removed stickers」，這次由 FTC 出手應該會再更有力道一些。