There is a domain pool which contains all domains in the world registered and many people/companies in the world will scrape the list 24/7 to filter sth to meet

There is a domain pool which contains all domains in the world registered and many people/companies in the world will scrape the list 24/7 to filter sth to meet their own needs. Except this, there are a lot of possible reasons you may expose your website to a bot: 1) if you choose wordpress, when your site is a alive, site will Ping some services. 2) when your site is live, your site's IP is fixed, thus may get scanned somehow. 3) when you register your domain, your provider know your domain, the name can expose to somewhere. 4) if your domain name happen to be a "reused name", your website is exposed. There are many many possible ways I don't even know, but in a severe case, people will receive spam email less than 1 hour after they bought their domain, you guess it. Nothing is hidden today.