Shatty deal and what a mess, but 3/4 full on that large of a sink is a tonne of water, as evidenced. I would never fill it up that much, just asking for trouble. I'm not so shocked it failed, nor would I really be surprised if it did fail. Sure it should handle it, but you're just adding t he the risk.
Many reputable counter companies will only glue/epoxy/silicone the undermount sinks in, and occasionally add a cross strap in, but even then you're just relying on 2 or 4 screws into melamine pressboard.
All it takes a bead of the glue being off and you're hooped, this isn't a case of Truman building the house with orphan bones or chinese knockoffs, it was likely a slight quality issue with a trade, not some monsterous conspiracy to deceive you or its buyers
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