I don't hear the Cm, it just sounds like C to me - and all the charts I've found online say C major. Where are the ones that say Cm?
As mentioned, the bVII chord has been a rock convention for at least 60 years. It's following a rule, not breaking one!
The Am, as the minor v chord, is a little more unusual. It comes from the same theoretical source as the C (the parallel key D minor, or D mixolydian), but rock more often uses the major V (A).
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"There is a crack in everything. That's how the light gets in." - Leonard Cohen.
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