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great oxidation event was a hell of a lot earlier than when im talking about and was when everything that could suck up free oxygen had reached its saturation point and it was then it built up slowly in the atmosphere and slowly started making seas more acidic. At that point nothing relied on oxygen to survive, and so none of it was being naturally processed by anything else. Oxygen dependant life started off as a niche just before/during/after that and its not for hundreds of millions of years there is any vegetation larger than shrubs, and its taken just as long for the earth to hit its balance.

we have archaeological evidence of periods of extremely high oxygen content (thats how the massive ancient old growth forests got so big) followed by massive periods of unchecked wildfires due to high oxygen and no human intervention. On top of that, saturate something that doesnt usually burn with oxygen, and it burns very quickly.

the fire triangle was a thing for billions of years before it started getting taught in OHS classes.

the fact we are even here to talk about it in the grand scheme of things is just pure chance on orders smaller than winning the lottery.