Why immediately after registering a domain, unknown IPs immediately come to it?

Question

Domain Name System

Immediately after registration, requests begin to come to the domain, how do they theoretically learn about the domain, and who gives them this information, and why?

Answer 1

https://whoisds.com/newly-registered-domains
And a bonus article with links: here

Answer 2

Since it was possible to determine that after registration dubious IPs run to you, it means that you can collect statistics from them. Catch everything you can, php \ js functionality to help.