> A problem is that deciding whether or not a customer was converted from an ad viewer is done by the people you pay for ads.
If you rely on their reporting, yes, but you can aleays set up your own basic attribution (with some caveats around ios traffic due to the ATT changes, but in that case the reporting comes from Apple). There are also third-party providers that can do attribution for you, but somewhat costly.
This makes it sound so much easier than it actually is. Tracking where customers from on iOS device is extremely difficult. Now spread that difficulty over 10 different advertising channels (youtube, Facebook, direct visits, google, etc), each with millions of dollars in budget, and the problem quickly becomes impossible to track yourself.
If you rely on their reporting, yes, but you can aleays set up your own basic attribution (with some caveats around ios traffic due to the ATT changes, but in that case the reporting comes from Apple). There are also third-party providers that can do attribution for you, but somewhat costly.