Simple question how these scame websites rankes so well in SERP

Hi, I notice the issue of these scamming websites since years now, e.g. first they were appeared to me in .ir multiple domains later on .ru an lastly .it an .pl ,
in fact some of them ranking very well in SERP specially on my region/language.
I want to ask what SEO strategy they use with their copied, duplicated contents ?
They're outranking many websites I had, Are I missing something here ?