I encountered a variation of the 'backdoor' one. After the client commissioned a new website without his sleazy backlink farm hidden, he tried to convince the client that the new site would ruin their search engine rankings unless we put his scripts back on. When rebuffed, he started making wild claims about the new site being insecure (best example: "this nginx thing they use was made by RUSSIAN HACKERS!"). Didn't work out great for him.
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I encountered a variation of the 'backdoor' one. After the client commissioned a new website without his sleazy backlink farm hidden, he tried to convince the client that the new site would ruin their search engine rankings unless we put his scripts back on. When rebuffed, he started making wild claims about the new site being insecure (best example: "this nginx thing they use was made by RUSSIAN HACKERS!"). Didn't work out great for him.