I suppose stuff like SPOT and cell phones are a low bar for activation. It's hard to imagine how a true PLB like an ACR could be inadvertently activated, though. Not only is the switch protected you also have to unfurl a long antenna. With the Garmin Inreach and Mini the "SOS" button is also under a cap that must be removed, then you have to confirm the SOS.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman