As others have pointed out, such algorithms written by amateurs have been demonstrated to work. You also assume people are meticulous in taking precautions and

As others have pointed out, such algorithms written by amateurs have been demonstrated to work. You also assume people are meticulous in taking precautions and never make mistakes. People whose access to information is restricted (such as by the great firewall of china) won't even know stylometry exists. Even if it doesn't identify all cases, the chilling effect is enough. Authoritarians are not known for their attention to false positive rates. --- You didn't even try to address that dissent will be identified before it reaches a sufficiently conscious and intentional level to even consider taking precautions. Most people don't have alts for normal usage and tying an account to IP to real person is easy for the government. The only difficulty is identifying opponents at scale. --- Finally, please don't dismiss arguments by employing the "sufficiently snarky comment" technique.