Piwik allows you do not log any number of bytes of an IP address. So you can eg. make it log and display 123.213.x.x instead of a full IP. This is vastly better

Piwik allows you do not log any number of bytes of an IP address. So you can eg. make it log and display 123.213.x.x instead of a full IP. This is vastly better for privacy than sending all your visitors details to Google in the USA. What kind of trust are you talking about?