[Onavo]

The short answer is that a lot of states now require KYC by service providers under the guise of adult content prohibition, "protecting the children", or mass surveillance. So the service providers like Facebook are trying to foist off the responsibility to the operating system. The pesky details of storing and managing PII becomes Somebody Else's Problem, and if the operating system implements an easily bypassed KYC e.g. a simple check box and then the kid get radicalized or get exposed to problematic content, the service provider can just shrug and point the finger at the OS. In other words it shifts the responsibility to the lowest level instead of the platform companies.

[crooked-v]

You can frame it nefariously, but honestly, it just makes way more sense to me. I want as little of my personal info as possible in the hands of random services, and that includes the stuff needed for KYC checks.