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Yeah, the thing most people don't get about cpr is that cpr mostly doesnt work. Iirc, there is about a 90% chance that if you have to start cpr, the person is going to die. It really is a last ditch effort.
Fortunately, I did know that statistic. It's even less for those to recover from CPR alone. It gives first responders more time to get there. That's primarily what it's good at. Give time for more advanced life saving care to be given.
It's not super great odds to begin with but part of the issue is people not being mentally/physically prepared for it. This paper says only 46% of bystander cpr was performed effectively. Still almost always better than nothing, but optimal cpr should leave at least one broken rib and you exhausted.