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None of what they're offering in exchange for biometric data is worth giving up biometric data. It does potentially allow them to collect fingerprints that could unlock a phone or computer against the customer's will at a later point in time if police/three letter agency felt like demanding it. I'm sure it's only going to be used to customize sandwich orders though.
Social media is just word of mouth with a larger audience. This should've been where lemon laws kicked in against the manufacturer's defects by Kia/Hyundai, but lobbying lets you buy your own justice these days.