It's a side ecosystem just like restaurants (Square has had a stake in Doordash after selling Caviar to them). Today, Square for Restaurants also released in Canada.
As a SQ investor I'm not crazy about this play but I see the long term reasoning. I also think JAY-Z might help with Cash App although its booming on its own and very much has the rapper demographic already (there are no shortage of songs and albums named Cash App for a reason).