Github collaboration: does it matter where the GitHub repo lives?

Hey friends!
I am wondering if it matters on whose account a github repo lives. I oftentimes have some project idea and then usually my collaborator goes ahead and creates a github repo for it. I didn't mind it until I noticed that this is a pattern with so many people folks seem to care a great deal to have the repo live on their accounts.

My questions:

• When and why does it matter?
• Does it matter, if the project is non-commercial?
• And does it matter if the project will be monetized?

Thank you!