Because people don't generally build from the ground up like they're selling fake IDs and cocaine on the darknet. They have no experience, and no understanding

Because people don't generally build from the ground up like they're selling fake IDs and cocaine on the darknet. They have no experience, and no understanding on how normal everyday choices and behaviors leave trails which track back to them. When they register a domain, did they use false info? Payment cards well detached from their identities? Do they post code to GitHub with accounts tied to their personal e-mail addresses? Does any normal person sit down like me and think about the ways their true identity can be discovered? "LOL no I'm not selling drugs or snuff so I have nothing to hide nothing to fear! :^)" is the chorus most recited. Ergo, when MPAA lawyers come knocking, they got the dox and they got men with submachine guns and badges on speed dial. Set it up right and you can thumb your nose at all of them forever.