Ia this just desktop? No mobile?

How wide of a margin could it possibly be when their market share is in the single digits?

Edit: I looked it up. Their market share is 2.3%.

https://gs.statcounter.com/browser-market-share

This trick is common enough and trivial to reverse engineer. I can just purge my billion-email-address hacked list of all characters between a + and an @ and have a clean list that untraceable with your system.