I mean for my devices, he hasn't found any reasons.
He could put locks on my sister's phone, which he did for a while (that's what I mean by restricted screen time) but then took it off after a while. Not sure why he did that.
I should clarify, he brought the phone for her, so it's "her" phone but ultimately he paid for it. I plan on giving mine to her if I decided to upgrade mine.
If you mean a blocklist on porn and sexy sites, I could maybe accept that, but still, it's not something I would really like. I like having control over my phone. And watching or reading porn/erotica doesn't get me to a orgasm so what's the point.