you can all the blogs and domain authority ......
i think he is clever in writing copied content so google also did not catch him, any once google catches him him what ever the site popularity...
in on page optimization Keyword Research Meta Tags Images Content Headers Schema
i think back links are still important for seo point of view they help in keyword ranking and serp
thanks for providing good article,,,
i will try this tool and let u know about this.........................
maintain duplicate content is not good option for u it may leads to penalizes the site be carefull while creating content .................
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