I can't imagine taking it away from my older kids (14,11). They use it to chat with friends and play games with them, do homework together, make plans and share common experiences and videos.
It's not as simple as you think. You have no idea how shitty screentime is how much of a cat and mouse game it is. It's pretty easy with a two year old, you just wait and see though...
Anyway, let's not assume everyone is a parent and ruin the whole online world with rules to "protect the children" made by the same people that never arrested any Epstein clients. We know they're not doing it to protect children. Let's not even pretend they are.
I live in Israel where kids are given a phone at an extremely young age (partially because of the security situation). Teachers give homework over WhatsApp, schools announce changes to the schedule, etc.
What I'm saying is it's almost not just up to you anymore, it really depends on your circumstances.
One of the exercises was to check out what you can and can't do with a locked-down smartphone. Several minutes later the kids figured out how to bypass parental controls using ChatGPT and the method spread like wildfire.
I recall defying my father's orders regularly. Teenagers who set their mind to something can be amazingly persistent. Most parents don't have the sort of resources required to control every aspect of their child's life like that. It's also harmful in the long run.
You can't fix a behavior issue with tech, just like you can't fix your computer by being good.
I lied to my mother a lot. My mother still isn't in the loop with my life - I'm in my late 40s now. It would have been much better to have been able to talk to my parents honestly about stuff I went through. It would have been much better to talk to me about things and get honest information about dangers.
Not doing something isn't enough. If your kids know about something, it isn't always going to matter what you do. If I were smart enough to know different folks did different things, I'm guessing other children are as well.