1. Not sure on this one.

2. The auditor is to make sure you are installing an authentic version of graphene. That it is not a modified version that has been tampered with (e.g., backdoors).

3. Automatically enables MAC randomization. This can help with being tracked on public networks. Fingerprinting techniques have gotten better though with deep packet inspection and even measuring radio characteristics. I've seen demos of two brand new and identical models of iPhones being distinctly picked out due to variances in the radios during manufacturing.

Doesn't help with advertisers tracking behavior based on IP. VPNs help with "blending-in" by putting multiple users behind the same IP. Provider matters here. Needs to be a VPN provider that won't just sell your data or cave to law enforcement. Mullvad is my preference. Paid with crypto. RAM only logs. That said, use Tor or I2P for anything you don't want subpoenaed.

For additional tips:

• Can't remember if its on by default, but auto-reboot to put data at rest (encrypted and not in RAM). This is for a state-actor threat level, and less about advertisers.
• I prefer pin codes to unlock my device and don't use biometrics. Graphene has a feature to randomize the pin pad every time to protect against a recording of the pin be entered. Specifically where the numbers aren't picked up on the video but the pattern your hand makes can be seen. Again, more of a state-actor threat level.