Hi,
Google is very strict about not sending PII (Personally Identifiable Information), and has been for years. But with GDPR legislation on top, it is a serious issue, and Google can actually close your account if you send PII to Google Analytics. I have worked with GDPR for a lot of clients, making sure that the shops comply with the different issues with regards to GDPR. One thing I haven't been aware of is that the customer email is sent in the URL, when the customer uses Guest Tracking. This definitely needs fixing, but I cannot find any posts that addresses this or modules that fixes this.
Has anyone come accross this being addressed by PrestaShop? Or even have a suggestion for at fix?