Most memorably, I reached someone who imported erectile dysfunction supplements from China, only to have them destroyed by order of the FDA because they were actually made with prescription drugs. He said he felt the manufacturer defrauded him and was happy to talk.
But that hasn't worked for me in at least three years, as far as I can remember. The robocall problem has just gotten ridiculous, so everyone's paying to be anonymous. I briefly had a domain registered without privacy protection a couple of years ago, sort of out of principle, and immediately started getting spammy calls about SEO services.
If you don't want your personal information to be visible thats very different to the full range of what whois can do. You can always use a proxy so there are options for privacy available. I've never got a single spam email/call from my whois data.
Also, ARIN only has allocations made in North America. Plus, ARIN only covers North American allocations.
It's a pretty common thing with European providers, I think.
WHOIS blackout and redesign under GDPR should address the problem of some registries requiring non-obfuscated WHOIS (some even requiring me to put in the ID number of my ID card)