A number of reasons.
The biggest is identity theft. Your private data becomes markedly less private online, and all it takes is you putting it in the wrong place for someone to be able to steal important things like bank information or your social security number. They can then freely use that information to steal your money, take out loans in your name, or do other negative things to your self and your character.
There’s also certain risks with having information like your geographic location out there. People can stalk you, send harmful things your way, or harass you with advertising materials.
As a final point, governments can use stolen data to oppress people. We don’t see this as much in the US or UK (although it does happen), but in certain places like China, data from the internet is used to oppress groups of people such as the Uighars.
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