https://edri.org/our-work/open-letter-gender-inclusive-and-safe-digital-world-that-is-free-from-violence-for-all/
Summary of what they said:

It might be abused to accuse people of sending unsolicited content, when it was actually solicited.

A man might do this after ordering content from a sex worker.

There should be more risk assessment requirements.

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I'm worried a "risk assessment" could become a one size fits all solution for many platforms, even ones where it doesn't make sense.

Perhaps, a platform might be less moderated, and that is part of the appeal of using it. Perhaps, a platform might be more adult.

Also, it creates a window for bureaucrats to interfere in platforms in annoying ways.

Also, oftentimes you might know a friend doesn't mind a particular kind of content. Unsolicited is not necessarily unwanted.