No EIN and I haven't done any shops since they required it.
As of today I am still an active shopper with them, despite their comment that I would be deactivated without an EIN.
They call me sometimes with shop offers and today have more shops on their job board than I remember them normally having, but the recent bad weather in my area might have something to do with that.
There is every indication I could do shops with them. Maybe another time.
Happily shopping Rhode Island and nearby Massachusetts and Connecticut