The "protection of children" has been the cited reason for a lot of controversial laws and measures recently. A common response is that parents should use parental controls to manage that on their own instead of relying on the government to do it to everyone. I found this article interesting since it touched on how the existing tools aren't that good, and addressing that problem might be a better thing to focus on
Authors:
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Sara M. Grimes | Wolfe Chair in Scientific and Technological Literacy and Professor, McGill University
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Riley McNair | PhD Student in Information Studies, University of Toronto
I assume Microsoft and Google don't care much about parental controls because it doesn't make them more money, and even if something goes wrong and someone tries to bring a lawsuit it won't really hurt them. It's like that scene from fight club about when they do a recall. (That and they're probably cool with kids seeing right wing garbage, because these companies are largely right wing garbage themselves)