https:\/\/universe-club.jp\/help\/questions\/view\/12403

Proof of income isn’t required when joining. In your case, perhaps you didn’t have the “steady job” required for membership? Since you can’t join without steady employment, maybe, for people like individual investors—who may not have what you’d call a regular job—they asked for proof that you had a legitimate income. If you did have a steady job, perhaps they requested it because something seemed suspicious, like you didn’t want to disclose your company’s name. Though, if they thought you were suspicious, they’d simply refuse your membership…

That’s true, haha.