system
A chat on subreddit /r/wallstreetbets
human
This is just the US app.  They're outperforming the competition Wendy's has 1million installs, chick-fil-a 5million. Burger King 5 million.

gpt
Burger King just added the in app ordering.  Previously you only had coupons, so now the app is for the first time itself generating actual revenue.  That said, the golden arches are unlikely to ever be toppled domestically.