"We found that Namecheap’s proxy service, Whoisguard, registered or used 45 domain names that impersonated Facebook and our services, such as instagrambusinesshelp.com, facebo0k-login.com and whatsappdownload.site" via: https://about.fb.com/news/2020/03/domain-name-lawsuit/

Facebook thinks they have a "legitimate interest" to know who put up these domains, Namecheap does not. As generally unsympathetic as I am to Facebook, I think they are in the right here. Those domains are obviously designed to confuse people into thinking they are accessing Facebook products or services.