I’ve got a marketing@ unsubscribe mail from a certain service, with the unsub link going over jcabjd.r…bh.d.sendibt3.com. Firefox refuses a cookie for invalid domain, the unsubscribe does only work in Chrome.
Looking this up, whois refuses my request, but the site who.is says, the Nameservers are cloudflare ones, with all contact info being REDACTED FOR PRIVACY.

In short, is this domain safe? And why can public companies’ entries be redacted for privacy?