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@BrickMan
With this pedal insert/ thread failure I'm going to say lack of pedal washer. Seen dozens of downhill/mtb cranks broken there, usually because pedals and in and out of them a lot and tightened up by a maniac. Often you get a little tell tale burr that sticks out from beginning of the crack. Super strength cleaners don't help as they can affect alloy once a crack has started. And then impact damage, downhill + fixed both will suffer heavy pedal strike that to be honest is gonna start something happening in a crank arm.
FSA's cheapies (gossamer and or omega?) that was fitted to just about every cheap spesh from 2009 to 2016 all dissolved in one way or another given enough salt + traffic light sprints.