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Pornhub Sues Texas Over Age Verification Law
(www.vice.com)
This is a most excellent place for technology news and articles.
Of course kids would still try to access porn, there's always ways around walls on the internet. Just like how banning guns wouldn't prevent everyone from accessing guns, and banning sale of alcohol to minors doesn't make minors stop getting drunk.
In that sense, I do suspect that if there were more boundaries to accessing porn, children would watch it less, and would maybe be less likely to be exposed to it without their consent.