Many companies do not want to take that risk and will ensure they comply by the license. And anyway, what does it matter if someone steals your code? The point

Many companies do not want to take that risk and will ensure they comply by the license. And anyway, what does it matter if someone steals your code? The point of the GPL is not to prevent people stealing your code but to hope that it at least provides some value to others through good faith forks respecting their freedoms.