To make you censor yourself so they don't have to. Same deal with the porn one. There was a piece by Alec Muffet not so long ago discussing the consultation process for age verification. All those involved knew that the headline group (teenagers) the law was supposed to protect were by far the most likely to circumvent the measures, so any such system is essentially not fit for its stated purpose.

Even if the intent is to play well with the authoritarian and/or socially conservative portions of the electorate, the effect will still be self censorship.

My SO and I both have to undergo enhanced disclosure and barring service checks on a regular basis for our jobs, one of which is in education. The UK Department of Education just effectively prevented Milo from speaking at his old school 'because extremism'. So how should I be feeling right now about following links from Reddit or other forums discussing US electoral politics that might lead to Breitbart? What if there's another situation like Sad Puppies vs the Hugos and I'm trying to get a picture of what's going on and I click on a link to find a Vox Day equivalent? Did I just endanger one of our prospects for future employment? Hard to say. Will using a VPN service get us tagged as 'something to hide' and affect our eligibility to work with children and vulnerable adults? Don't know. Worth betting someone's career on?