What has changed in Google algorithms since August 1st?

Question

Google

I observe a symmetrical decline in Google for a number of sites neatly after August 1. Tell me what has changed in the algorithms?

Answer 1

there is such a thing, search: https://yandex.ru/search/?text=google%20update%201...
You will not find more information than the link.

Answer 2

Google has updated its core algorithm.
Now we need to make the pages more useful and better responsive to user requests and work on improving the PF on the site as a whole.
How to make content on communication sites more useful read here
How to improve content on commercial sites read here