https://www.techdirt.com/2023/08/14/wisconsin-pushing-bill-that-requires-websites-to-treat-all-users-as-if-theyre-children/
Okay, I wrote an earlier version of this, but I wanted to sum it up better, so here's another post.

Some things to consider here:

1) IPs are not individuals (one might be shared by many on a mobile network).

Or someone might use a VPN. This might be for a number of reasons, including for security at a less secure hotspot.

It's very presumptuous to assume it's simply to bypass an "age restriction". There are many reasons other than this.

2) Geo IP is not always reliable, particularly at a smaller scale (i.e. cities).

3) IPs are cycled fairly frequently. How do I know someone's intent for doing so?

4) Feedback about things going wrong might not reach a platform. Often, it won't.

5) Parenting could address minors fooling around at night. It's already widely practiced.

Lawmakers here have not shown that the problem they look to address is actually a problem.

6) Accuracy is hard to measure. Exaggerated marketing materials, or artificial tests in labs, have a tendency of catching people's attention.

7) At scale, any inaccuracy is going to be a problem, and will lock out a lot of people (who may be vulnerable and / or disproportionately affected).

I've seen these systems going wrong in practice. Often, that is it, you are out.

8) If someone moves, have they "actually moved", or does a social network have to assume they're using a VPN?