I am more curious - do web hosts get any kind of analytics from the search engines or is this just an empirical observation of how traffic has decreased over a unit of time?
Unless the browser is configured otherwise, there is a referrer ("referer" to be precise) header that the server receives when you go to a page from a link. This is how it could look from the webmaster's point of view: https://plausible.io/plausible.io/sources
