Just because you don't know how it happened doesn't mean it was a secret conspiracy.
The TPP began life as a deal between Singapore and New Zealand, quickly joined by Malaysia, Brunei and Chile. Next to join the negotiations were Mexico and Canada. Australia and the USA were last to join ( not sure of sequence). We are now more than 10yrs into the process which was set up under confidentiality rules to protect negotiating positions but which allowed conspiracy theories to flourish, especially as negotiations dragged on. The full text is on line so no secrets. If anyone wants to make claims about what it does or doesn't do they should read it or any of the published analyses of the text.