Domain privacy is not just about email spam. First of all, you will also get letter spam and quite a few scammers that try to trick you into moving your domain

Domain privacy is not just about email spam. First of all, you will also get letter spam and quite a few scammers that try to trick you into moving your domain to their services by claiming to be "The Domain Registry Of America" (a London-based company, which contacted me multiple times). Second issue is privacy. Despite (rather useles) efforts by registrars and registries to prevent mass queries to Whois servers, there are _huge_ searchable databases of Whois data. This makes it possible for comptetitors to "spy" on your projects, for crooks to determine your wealth and location, for lunatics/stalkers to be always up to date on your location, etc. I personally use nearlyfreespeech.net for domains and domain privacy.