I have been getting those emails too, and I noticed that they get automatically send to spam ~5 minutes after I receive them. I seem to be getting a spam email

I have been getting those emails too, and I noticed that they get automatically send to spam ~5 minutes after I receive them. I seem to be getting a spam email of this kind almost every day for the last ~6 months. Maybe the spammer found a way to prevent fingerprinting by Google and each batch of emails only gets automatically marked as spam after so many people manually mark it?