Kids find ways around everything. Even adults find the 'digital wellbeing' tools on Android and iOS useless. Just look at the multitude of apps available for digital self regulation these days (ScreenZen, Freedom, BlockSite, etc). No single solution works for everybody at the moment.
Regulation by itself is also insufficient. But maybe combining regulation with parental controls plus other measures will be effective. A 'defense in depth' or swiss cheese strategy, with multiple layers of protection.
I do hope we figure out what layers are needed soon, though. It feels like we're running out of time.