Why Capacitors go bad

Funny story about buldging caps...

I read some time ago that a guy working for a capasitor manufacturer decided to steal the formula for how the caps were built. He then went to work for another company and they got the formula and produced millions of caps. Shortly there after buldging caps became a thing. Turns out first company kept a part of the formula secret so everyone who uses the stolen formula is in for trouble. Thats the way i remember it. Wikipedia has a slightly diferent accounting
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**** China.