Because general purpose processors are slower than a specific purpose module in an FPGA could be. Cheap is not an important consideration in this case.

This is why people need to follow style guides, so that all source code is styled the same.

The real problem is that you won't get China to get rid of their coal plants, so no matter what the U.S. does, the world gets increasing coal emissions.

And they shouldn't have been. It's up to the person who created the FB account to close it, or for FB to close it for them if the court ordered that.

Which is why you make up your own phrase. But in practice, the number of possible phrases that could be used make that kind of attack just as impractical as any other random attack. This is actually a simple cryptography concept that you're getting wrong.