2022, https://www.internetsociety.org/resources/doc/2020/fact-shee...
> Client-side scanning reduces overall security and privacy for law-abiding users while running the risk of failing to meet its stated law enforcement objective... Client-side scanning in E2E encrypted communications services is not a solution for filtering objectionable content. Nor is any other method that weakens the core of the trusted and private communications upon which we all rely.
2023, https://www.internetsociety.org/wp-content/uploads/2023/12/C...
“Client-side-scanning, despite the claims of its proponents, does seem to involve some kind of level of access, some kind of ability to sort and scan, and therefore there's no way of confining that to good use by lawful credible authorities and liberal democracies.”
— Ciaran Martin, former chief executive of the UK National Cyber Security Centre