I was at a esafety thing yesterday.
OMG eye opening and terrifying but one of the big messages was that things we do to try and keep our kids safe are ineffective and maybe even counter productive.
E.g. 6yos were well aware of ways round parents who turn the Wi-Fi off at night - you just set up the hot spot on mum's phone before you go to bed.
Don't let your young child have a phone? No problem they've probably "found" an old one of yours. It doesn't matter that it has no sim, they only use it with the Wi-Fi anyway.
Have they ever been in the neighbours' house? In that case their devices are automatically logging into their Wi-Fi, if yours is off or too restricted.
It was shocking, really young children and not just a few of them, knew all the tricks.