I don't like this whole thing, but compared to what I was fearing would happen, this idea is nowhere near as bad. What I expected was that we'd end up with the OS vendors actually being mandated to really do age verification, and then submitting that using Web Credentials and Secure Attestation so that the far end could trust the whole thing, locking open-source OS's out of the mix and creating more of a walled garde…
Time to start throwing up hobby BBS sites... and I think in this case text mode interfaces over web might be an advantage.