For me, the problem is not all screen time, but big tech proprietary software companies. I don't support regulating screen time, but I do think governments should regulate big tech companies harder, while investing in free software - that genuinely serves user interests and has no incentive to be addicting or harmful - as an alternative.

Big tech explicitly tries to keep people addicted, whatever the consequences. They don't support user agency. Even if you want to make Facebook/Instagram/TikTok etc. less addicting, you are limited to a "show less like this" button that probably does nothing. On iOS and Android, companies abuse the notification categories, and yet there's no way to filter out keywords or work around this, despite the widespread abuse of user attention.

If everyone had full control over their own (or their child's) devices and algorithms, I doubt there would be such a backlash against technology as a whole. But, despite all the bad the techbros are doing, technology can be so empowering when it serves the users. To regulate screen time seems to me to treat the amazing parts of technology the same as the worst parts.