I can see that, and if this were the only way for people to look up a member of the public without them having created a public profile, I wouldn’t support it. It would be much easier to stalk someone through the websites where you can input a phone number and get all the associated addresses and additional contact information, though. In jurisdictions where those are allowed, I think the information shared on this type of platform is much less useful for stalking and more useful for legitimate purposes.
Although I would be curious about how a platform like this would work legally in a jurisdiction with solid privacy laws.