> Do you really think Google just set the price arbitrarily?
No, not arbitrarily. But that $14/mo bundles in the price of other services as well, namely Youtube Music. Youtube Music doesn't cost Google nothing, so obviously $14/mo isn't what they're getting from people in ad revenue. A comparable music subscription from spotify costs $11/mo, so subtract that from $14/mo. $3/mo is a fair estimate for what they expect to get for showing ads.