As someone who worked in camera and product design for a large Japanese company - including making some supposedly "German" cameras.
I kind of see two sides to this. I do however agree that it certainly seems distasteful, if quaint by todays standards, if we see what they collect on us nowadays.
On one hand - yeah the marketing department absolutely got a copy of this - even in the "before times" and they likely had a field day with this kind of invasive data. I mean if I had the choice to give my personal data to Nikon or Mark Zuckerberg, I'd probably chose Nikon - by a very slim margin. (They might sell it on anyways!)
On the other hand, sometimes we'd actually learn something surprising from these kind of surveys and customer samples. For a example when we got data on a certain camera model being overwhelmingly popular with women, despite being originally designed as unisex and/or for guys - it was a big surprise.
This then led to some revisions for the second generation, namely making the case molding a bit smaller and making some buttons easier to reach if you have small(er) hands, something I am sure the (unintentional) target audience appreciated.
Edit: Oh and a certain colleague who shall not be named wanted to use this as an impetus to "cute-ify" and simplify the menus and styling of the camera. Something I and some others vehemently opposed, which led to some testy product meetings.