I think I read someone suggesting this also with tracking cookies on a stackoverflow, probably prompted by the GDPR question, which I don’t know enough about. But it did also get me curious how they do it.
Wordle 241 3/6
I’m personally not that interested in my Wordle stats. There’s at least a couple of days where someone either spoiled or partially spoiled the word and helped me guess it. One day I tried the NYT site and then checked on the old site to see if it was the same word, so I got it in one.
I would probably care more if OGS wiped all our old ranking stats… oh wait 
That said it did probably copy over those stats somehow, and I’m not sure when. It’s also going to be device/browser specific stats etc too.