Work in the context of immigration means participating in the local economy. A person visiting SF to attend YC is not working for a U.S. company, they are not participating in the local economy, they’re on a business trip conducting business.
> A person visiting SF to attend YC is not working for a U.S. company
They very well could be. And it could be a US company with US investors (YC)
> A person visiting SF to attend YC is not working for a U.S. company
They very well could be. And it could be a US company with US investors (YC)