The privacy access for this add-on is atrocious. Check under Permissions, and you will see:

-- Access your data for all websites
-- Download files and read and modify the browser’s download history
-- Access browser tabs

How is this OK? I understand their need to protect against phishing, etc, but access to ALL data, that's borderline unethical and vast potential for data leakage, and corporate maleficence.

Some additional quirks, as noted by others. Sites such as nextdoor.com will not allow login, even when PIA is not connected. The extension needs to be disabled.

One cannot connect if zscaler is running on the OS.