Smart contracts sound like a bad idea

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Explain how it makes sense to rely on external sources which can then automatically deduct money from you. Who would subscribe to that?!

Lets take a fishing transport company as an example. They put sensors into their fish tank to monitor if the fish is fresh and if the sensors report that it is, the money will automatically be deducted.
Uh ok, what if the guy just puts the sensor in a bucket of fresh water and the entire truckload of fish is actually rotting right next to it? What then?

Crypto coins are just a distributed database who's only storage type is a single string key apparently. That's fine if all you need is to store unique keys, but any other application seems like a reach.

Summary: Chainlink sux, there is nothing secure about agreeing to a contract that automatically deducts money from your bank account because some API says so.