Whois data is also a dox/social engineering entry point.
That basically includes most of the default anti-scraping methods but since you only have one page to do it on, it's far simple to get 99% of the bad guys out (Spammers usually stop bothering once you get more advanced than ROT13 via Javascript or images designed to trip up OCR but still being readable)
If somebody has legal beef with me, having a contact address to quickly resolve it is more important.
Besides that, you can always simply get legal with the registrar who will get them your address anyway (or escalate until you find somebody who knows who you are)