How to check a site for a text filter?

Question

Search Engine Optimization

I have a line of sites of 19 brands, each brand has 20 subdomains. Between brands, the content is different, and in the subdomains of the brand, the text is the same for the most part. The traffic began to sink, the webmaster does not write anything, and the pixel plus says that there is a possibility for a text filter post and Plato says that they are not to blame. There is no affiliate. How to find out what sanctions or filters are on the site?

Answer 1

Good afternoon!
If you have an online store, then unique content should be only on the contact, delivery and payment pages. Perhaps even on the main page of the subdomain. It makes no sense to uniqueize on cards. Search engines are quite adequate in this matter and everyone understands)
Here is a useful manual on filters:
https://pr-cy.ru/news/p/6826-filtry-poiskovykh-sis...
https://pr-cy.ru /news/p/6841-filtry-poiskovykh-sis...