Notably, around `08 or `09, these cycles stopped. From the outside, it looks like Google stopped trying to fight spam and just gave a bunch of huge sites a permanent boost in rankings instead, so at least some of your results might not be spammy garbage.
Also honest content moved into video and podcasting formats (that are harder to index) or inside walled gardens like Twitter or Facebook. It's like if the internet was a sea and Google was the ship used to navigate it, the water has dried up and now it's just craggy shoals we have to navigate around to get anywhere.
