[ARCarr]

But why a ball of dough?

[striking]

Probably something to do with "dough" being a metonym for money?

Really contrived and silly, though. They could've just made it monochromatic with a huge Venmo logo on it.

[tazard]

Because you knead it

[schnevets]

Same reason for the "Lucas" subway ads from a few years ago. Weirdness goes viral.

[mewfree]

Maybe because it's an homonym to John Doe. Sounds like a programmer joke to me. Some kind of "image placeholder".