This is part of a large movement to end personal computing as we know it, and give all control over our digital lives to the mega corporations. It is already impossible to use some national ID or banking apps on non-Apple and non-Google phones. (say GrapheneOS), giving them an immense edge in the market, and they're using that domination to add more restrictions like installing non-play store apps on Android. This goes bit by bit, try to add a restriction, go back enough to quiet the backlash, try again. This new law is a foot in the door to achieve the same restrictions on PCs. PCs are the last open computing platform and bastions of personal digital freedom and thus they must be destroyed by capitalists and governments. Once the technical means have been put in place to restrict access to some services, the system can be hardened : impose that the age checks can't be tampered with by using a TPU module, impose a link to the individual's identity so that all online activity can be traced to anyone. Pretenses are easy to find : protect children, block sex offenders from accessing dating sites, and so on. At this point I'm pretty convinced we're geared towards a global totalitarian regime, and there's a lot of evidence.
It really bums me out that I fully believe this is it.
Megacorps seize the demand for regulation (to regulate them) in order to write regulation that purportedly does that, but in practice mostly closes the doors behind them and cementing their stranglehold on society. For Microsoft, Apple, and Google it's a small thing to agree to age verification if that means all the potential competitors will have to do so too.
The cheapest time to shut down a competitor is before they get to market.