[_8j50]

1 is for domain only.

2, MS only knows some information that shows the site is malicious, it cannot tell if it is a compromise or just a malicious site unless it perhaps looks at reputation but even then the site owner should be able to tell new or malicious files on their webserver withour MS telling them, if they can't even do that they have bigger problems and threat actors do abuse anti-abuse systems like this all the time and they do deploy multiple things on your site as well as use it to attack other sites and monitor the reputation of their infrastructure.