Ah. Speaking as a parent who has made many, many mistakes, that makes all too much sense.

I will say that longer-term I absolutely do plan to give my kids unfettered internet access. The day will come they need to learn to cope with it, so might as well have them do it when I'm around to hopefully be of some help.

One slightly out-there idea for how to roll it back - ditch WiFi entirely. Internet access is by using a physical cable at one or two locations in the house.

Harder to subvert, and the kids see that you share the constraint, so it may be slightly more palatable.