I’m probably being persnickety but I find it ironic that my security company, Simplisafe, does so much tracking. These tracking attempts were all related to trying to purchase a replacement yard sign over a 10 minute period. 
No file.
The whole forum is having trouble serving images right now.
Strange, I see it in my post.
Image is back. Must have been a disruption in the cosmic background radiation.
Anyway, trackers. Yes, annoying. I’d guess your supplier is buying web services from a company that’s doing the tracking for all their accounts.
Have you looked into Ghostery?
I’ve used it in the past but I am assuming, perhaps incorrectly, that Apple‘s new security features in Safari is doing the job that I need to have done. The point is they weren’t able to track but I did see the report. I was just a bit surprised that the security company was doing so much tracking.