Mandatory age check is not going to reduce the number of criminals online. Period.

We should focus on teaching parents how to educate their children properly, and teach children how to safely browse the internet and how to avoid common scams and pitfalls.

I played Roblox when I was a teenager and all the time my aunt told me to be careful of who I talked to online, as they could be a pedo. Even though there wasn't a constant monitoring from my parents or family, her words were repeated many times that I actually thought 5 times before sharing any kind of personal information online, back then.