There's a meta-issue with pushing regulatory requirements that are trivial to bypass: you effectively normalize bypassing regulations and effectively create a culture where regulatory bypass is seen as "not a big deal" even if that wasn't your original intent.
People have been using VPNs because they think region-locking streaming content is something where the risk-reward calculus is fairly obvious, and from what I can see that's a fairly normalized cultural trend.
If you do the same thing with porn, you are now adding another layer of depth to the emergent cultural phenomena.
If you think there needs to be a serious conversation about porn access and psychology, implementing restrictions trivial to bypass only serves to reduce the legitimacy of agents trying to make the case for such education.
Edit: you also see this phenomenon with respect to COVID mask mandates