Because the Tor project is the only anonymity network with enough cover traffic and nodes to actually provide a reasonable amount of privacy to users. Yes, the

Because the Tor project is the only anonymity network with enough cover traffic and nodes to actually provide a reasonable amount of privacy to users. Yes, there are attacks that are possible but they are typically costly (at least ones that aren't targeted at hidden services) and are mitigated using recent inventions like Vanguards.