Shopify updates this cost breakdown against live data on a rolling basis, so the CPC and CPM benchmarks and the learning phase explanation stay current instead of quoting a number from years ago.
Global averages cited: roughly $0.87 CPC and $16.06 CPM as of the article's data pull.
About 50 optimization events in the week after the last significant edit is what it takes to exit learning.
Beginners are pointed toward small, $3 to $5 a day test budgets to read early signal before scaling.