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Re:Ask HN: Why is YouTube adding “&pp=sAQA” to video URLs? by duskwuff on Friday July 30, 2021 @11:50PM (#28015119)
Unrelated. The Wikimedia Foundation has actually documented the wprov query parameter. It's used to track the source of a link; "sfti1" is "Share a Fact on iOS for text shares, feature version 1".

https://wikitech.wikimedia.org/wiki/Provenance

Re:Ask HN: Why is YouTube adding “&pp=sAQA” to video URLs? by __henil on Saturday July 31, 2021 @12:26PM (#28019520)
TIL