Google uses Gmail to track a history of things you buy — and it's hard to delete

This is quite an odd thing for Google to do if they are not monetizing this information.

Two more things that are odd:

1. My purchase history only goes as far back as late 2014 (article cites 2012)
2. This only seems to work for Gmail accounts, not G Suite (business email hosted by Gmail)

Perhaps the last one makes sense and could be part of their ToS but sounds like a feature a business use could make really good use of, despite how shady it seems.