Not giving your kids access to the internet at all is insane. You're setting them up for failure by not actively teaching them how to navigate the Internet and what bs to look out for. Anyone that does this is just trying to indoctrinate their kid and prevent them from being exposed to any other ideas. The ego on parents that think they know enough to entirely prepare their kids for the world is ridiculous. Especially these days. You're just setting them up to be behind when they're older and they'll resent you while they struggle to catch up.

Better yet, don't let them use the internet.

Good luck with that. And also spying is the best way to lose your kid's trust.

My parents used this as part of their obsessive-control emotional / psychological abuse. Mostly to try to indoctrinate me into their cult, and their extremist right-wing ideology. There is a place for filters, and even search reports - but search reports ought to end around 14 years, and by 16 there needs to be some form of legal recognition of privacy rights as a human being for cases of isolating abuse as a part of indoctrination. P*rn blockers etc on the router are fine though, the network legally belongs to the parents. But human being, at least after puberty, requires privacy for proper psychological development. Complete surveillance after that time is psychologically and emotionally harmful to both the child and the relationship.

I'm reminiscing the days in school where we'd use proxy sites to get around the school blocklist/monitoring to play dolphin olympics

Reduce it gradually to 0 until 16.
Spare them the embarassement with their peers.