Where does such a snippet come from if there is no schema in the markup?

Question

Google

I understand correctly that such snippets in the issue are obtained thanks to the schema.org markup?

If so, why doesn't this page have anything to do with Rating and so on? How did they screw it up?
https://www.optimus-pm.com/digital-marketing-service...

Answer 1

something like
this What does it depend on when rating stars or the name of the author are shown in Google search results under popular sites?
always wondered how google punishes for this