Prevent websites that publicly provide links. It’s really likely that Google has already found out such web sites or has come near, and you may be struggling with penalties if you can get your website associated with their back links. As I just outlined: certainly impactful backlinks from significant authority https://docs.google.com/document/d/1odTgvCdp2YKE9wRYXNF83lq4CahsLC0dAc1qhyqHWsI/edit?usp=sharing