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TikTok requires users to “forever waive” rights to sue over past harms
(arstechnica.com)
This is a most excellent place for technology news and articles.
They are not a contract by themselves but they can absolutely be used to specify the details of the main contract the customer is about to enter, for example by buying something in an online shop, etc. and that contract is then in its entirety binding (assuming no laws are broken etc).