If you do research on that topic, you will find there is many, many ways of preventing those types of things.
Technology is neither good nor evil. its how it is used that is good or evil. Governments have started using computers to track people online, track their movements, their information, even tap our connections. I prevent the majority of that by using encryption for most anything I do, but that can be broken.
If you want to do something about it, join a Internet Freedom group. I'm a supporter of the Electronic Frontier Foundation, eff.org .
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