Unless they of course keep it to themselves. If employer hired you for data entry and nothing else. And there is no other work for that employer, is it fair that you automate the job and not get rewarded for it somehow? The only way to make things just might be keeping it from your employer. If the employer was intelligent they would have realized they could automate it in the first place and this type of employer likely will not reward the employee, but instead just get rid of him/her.