I don't think you can point the reason for this on one specific cause, and better bundle it up as "culture". I've wonder if this is also the cause for the low

I don't think you can point the reason for this on one specific cause, and better bundle it up as "culture". I've wonder if this is also the cause for the low appreciation for privacy in the Japanese society. I've noticed that the Japanese seems to be more "ok" with the idea of Google/Facebook/Line/big company snooping around and collecting your data, even engineers. It is also culturally more accepted to point out physical feature and ask private questions in this country. "you've become fat!", "Why don't you have a girlfriend/boyfriend?", "you speak/walk/do something very weird" is comments you can get from both relatives, co-workers and not-so-close friends. The typical "mind your own business" attitude you expect in the west seems to not be as prevalent here, and the "If you have nothing to hide, you don't need anonymity and privacy" is an argument most people consider to be valid here.