It's possible to set parental controls on YouTube with Restricted Mode, or via the YouTube Kids app.

Microsoft Edge has a "Kids Mode" that lets parents and guardians choose which websites their children can visit.

Young Minds gives parents control over what their kids do on the internet, while also protecting their children’s privacy and ...

Google Family Link allows you to manage your child’s screen time and restrict app usage remotely. Samsung’s Digital Wellbeing feature helps restrict screen time and control app usage for children. An ...