How program will earn money?

Answer 1

Program does not earn money.
Programmers earn money for their code

Answer 2

1. Programs perform the calculations necessary for the operation of any business.

2. Programs implement the storage and processing of data necessary for business to work.

3. Programs control and control complex mechanically electronic machines and robots used by the business.

4. Programs implement offline training and testing - like SoloLearn for example.

And much more...

And of course, programmers are paid for their writing, improvement, support, correction, etc.

IMHO