Ah, those are good questions. It really strikes me as a search for nuance and forethought that you're sharing, too. If so, one natural blind spot here is going to be the dichotomy of 1) an abscence of clearly-drawn lines and 2) a tendency to draw lines too firmly, too late or in a poorly calibrated way. It can be helpful to be aware of that, so you can more easily avoid swingy behaviors and positions that feel less authentic or even less loving.

One of the transcendant superpowers of nuance is not just that it's deep and considerate of all sorts of factors and outcomes, but that it also helps people understand better where and how to draw lines in given situations. This is really cool and helpful, even if it has to be used kinda faster than people may be aware, and in little prospective doses.

So, perhaps one of the best nuanced things you could do to pass along this gift of yours is to share with your children why you draw a line at outright snooping, and ask them what they think about how they use the internet for example (or their money, or...). What you'll be doing here is passing on a subjective perceptual quality factor in your inquiries and personal development, not just a lesson on inappropriate behavior, or whatever. This is pretty huge by itself! Developmental vitamins for your kids, basically. (A lot of what's inappropriate on the internet also has a side that would then naturally feel jarring or somehow off to a kid raised with those vitamins, IMO.)

You'll also have a lot of other opportunities to take in relevant hints as your kids continue to develop, so this is more like a set of questions to revisit over time, and you'll likely observe changes to the set of questions. For that reason I would recommend organizing your own approach digitally or on paper, keeping your personoal philosophy and technique in this area working & developing.

A danger point in this kind of consideration is the dichotomy of thought: "Do I X, or don't I X," for example. These questions are always begging for some rephrasing or new vocabulary. Sometimes it helps to first define the terms and the problems in depth, and second (mentioned briefly above as well) to involve the children in what is effectively you educating yourself. Do they see it as a problem? How would they phrase it? What does that teach you about how they learn best? What insights might it give you about their gifts?

"Aww that's nuthin dad" vs. "That's really scary to think about" can indicate two completely different sets of cognitive gifts at work.

Personally I grew up with a parental dichotomy of sorts. I had one snoopy parent and another who was very lax. To me as someone with kind of ridiculously high personal ethical standards, even as a kid, the snoopy parent made things so much worse. I realized that I could be an absolute angel, and that parent would _still_ find something to pin on me anyway. For example when I was 9 years old, they found a trash bag full of very-adult magazines at a construction site a couple blocks from our house, brought the whole huge muddy bag home, and accused me of hiding my stash over there! (Makes me laugh to this day, but it was also extremely hurtful)

However, this same parent could spot some things that other people just couldn't see--they had an amazing general perceptual ability even if it was overused when it came to some guessing games close to home. And so they actually intervened in some pretty amazing moments, like when our family doctor was really struggling in life, this parent was one of the only one of his friends to notice the signs and intervened to help him out before things got really bad.

Anyway, just some examples of how a parenting gift can also be a huge liability, especially when it turns things into this dichotomy, like "did you or didn't you" vs "hey look, what do you think of this situation, here's why I struggle". Everything we think is so great about ourselves, as parents, our kids have ways of demonstrating is just a fail in other ways. Even or especially if they have the diversity of mind to disagree with us, chances are they have a different set of natural tools, approaches, thought patterns, or other solutions that could also be really effective.

I'm assuming you feel like you have adequate access to swaths of professionals who can help you out along the road as well. Good luck.