On: Security through obscurity is underrated (2020)

[kayson]

So you're saying botnets will dictionary attack subdomains on every IP? Any sources?

[naasking → kayson]

No, I'm saying that's one of many behaviours. They mine domains and URLs scraped from email addresses, email headers and bodies, online content, and more. Your site is not "secure" when that security can be circumvented by someone pasting a URL into an email.