How to deal with the negative cheating of behavioral factors?

Question

Search Engine Optimization

Hello.
A couple of days ago, I noticed a surge in direct visits to the site. At first, I did not attach any importance until I noticed the increased failures.
I started to google the PF and realized that someone wants to downgrade us in the search results.
They come from different ip addresses for 0-3 seconds per visit. Under one address can come with different sessions.
I wrote a script that sends a request to the server every 2 seconds, there we already add 2 seconds to the IP address and session.
Next, we look at who has more than 2 visits up to 5 seconds, ban in nginx and give 403 (except for Yandex and Google bots).
The question is, how right is this? And how can you deal with these adversaries?
I also want to implement a question - an answer to the subject of the site, in order to add innocents to the whitelist.

Answer 1

No way. Search engines already have this mechanism.

Answer 2

Try setting goals, hard-wiring them to forms and areas. PF from direct visits does not break, Yandex has long understood this. But as an option, write to the TP to avoid drawdowns.

Answer 3

There is no single 100% way to deal with PF cheating. Yandex seems to promise to start fighting this, and it seems that it is even doing something already, but so far nothing. Many options for dealing with cheating are described here: https://t.me/siteclinic_doctor/1784 Maybe one of them will suit you! From the banal IP blocking to the implementation of the pop-up "Are you sure you want ...?" or install reCAPTCHA V3.