You have to trust that:
They're not logging your IP on their VPN and coorelating it with output traffic.
They won't dox you to motion pictures houses because of your torrents on their VPN.
They wouldn't slip you some javascript in their client at the request of a foreign government to dox you without letting you know.
Code is good, but there's a lot of operational information there that doesn't get exposed by being open.
Code in the face of no malice wouldn't be a large worry. They rolled over on a French activist and doxxed them for the French government. Those logs should not have existed in a privacy company.
Again, this is all old news now. Let's see him make hard decisions to protect the clients and turn the PR side of things from "the empire did nothing wrong" to hey, let's have an open dialog.