How many of the founders know how marketing budget is used?

Hi founders,
I had a conversation with a friend a few days ago and I told him I think 60%-70% of the CEOs and founders do not know how the marketing budget is being spent and how good the user matches the product they built.
He told me that he don't think there is a founder who do not know this information.

What is your opinion? How do you monitor growth? retention, how much do you actually know about the quality of the users you have? how far are you checking retention of a user and usage after the first conversion?

Please change my mind :-)