Turns out, a lot of it, actually.
Source: How Much of the Internet Is Fake?
The article is from 2018, and I have to confess I didn’t look for more recent statistics, but I can imagine it only got worse. I did a quick of search on this topic, and a lot of articles date from 2018, so it seems the attention just turned to other topics, but I don’t think the actual problem went away.
The Fake Web: How Nonhuman, Fraudulent And Invalid Traffic Is Taking Over The Internet (18 Feb 2022)
The ‘Dead-Internet Theory’ Is Wrong but Feels True – The Atlantic (31 Aug 2021)
All the levels of redirection (Rant 14 Sep 2012)