Offer feature to anonymise or shorten the referrer #15426

I would say we'd want to have different options maybe:

• Full
• Exclude query parameters
• Exclude path (basically only record the subdomain domain)
• Exclude subdomain (eg someone coming from example.matomo.cloud be still identifiable possibly). We would in that case only record matomo.cloud
• Nothing, only record the type of referrer type

This can avoid tracking personal data since the page a user comes from, might include it's name, or some ID, etc.