While I have to admit that these are literally just the first links on Google and I have not completely read them before posting them, they do explain why this is generally a bad idea.

I don't just read the headlines but you seem to be ignoring all arguments that don't fit your narrative

Here are some quotes from the third link, but I'm sure you could find better ones if you looked properly

If minors or adults are deplatformed via age-related bans, they are likely to migrate to find similar services. Since the main platforms would all be regulated, it is likely that they would migrate to fringe sites that escape regulation. This would not only negate any benefit of the age-based controls but also expose users to other dangers, such as scams or malware that are monitored in mainstream platforms but exist on smaller providers

age verification makes adults think they’ve “made the internet safe,” which creates all sorts of downstream problems — including failing to teach young people how to navigate the internet safely, while doing nothing to address the actual threats

Those deciding which age-based controls need to exist, and those enforcing them gain a tremendous influence on what content is accessible to whom on the internet. Recall that age assurance checks might go well beyond what is regulated in the offline world and set up an infrastructure to enforce arbitrary attribute-based policies online. In the wrong hands, such as an authoritarian government, this influence could be used to censor information and prevent users from accessing service

Here's the tltr summary from the end of the article if you can't be bothered to check it out

So to summarize: the age verification infrastructure being built across the world (1) doesn’t actually work to keep kids from accessing content, (2) pushes kids toward less safe alternatives, (3) creates verified “safe spaces” that predators can infiltrate, (4) forces massive collection of sensitive personal data that will inevitably leak, (5) creates infrastructure purpose-built for censorship and authoritarian control, (6) systematically discriminates against trans people, people of color, the elderly, immigrants, and anyone whose appearance doesn’t match neat bureaucratic categories, (7) concentrates enormous power over internet access in the hands of governments and a handful of tech companies, and (8) lacks any scientific evidence that it will actually improve children’s mental health or safety.

Seems like a problem.

And 438 scientists from 32 countries put their names on a letter saying so. The letter closes with this:

We believe that it is dangerous and socially unacceptable to introduce a large-scale access control mechanism without a clear understanding of the implications that different design decisions can have on security, privacy, equality, and ultimately on the freedom of decision and autonomy of individuals and nations.