Yep, those look like bottom of the barrel cheapo compressors. Even then, catastrophic failures are very rare. With rust it almost always starts with a pinhole leak that gets larger and larger. I'd be willing to bet that in both those instances the tanks were over pressured by a faulty pressure switch and relief valve. Of course improper maintenance and lack of draining can accelerate the demise of both those components. And of course some people will readjust the pressure switches to a higher pressure and disable the relief valves to get more pressure.
Those look like structural failure of the tank on a fundamental level rather than rust failures.
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