In the 326th episode of Semantic Mastery's weekly Hump Day Hangouts, one participant asked if creating online tools like whois checker would inadvertently benefit competitors as their domains will be crawled.
The exact question was:
Hey guys, looking to build out some online tools for my web hosting business like an online whois checker etc which will create new domains with info about different domains. Would doing this inadvertantly benefit my competitors as their domains may get crawled and listed on the whois tool? There wont be any links going to the domains just information like brand name, image of homepage and whois registration.