The MIT license says:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
Bob finds a nice piece of MIT-licensed software called X. However, this software is way too geeky for the general public to use. Practically, only IT-savvy persons can use it.
Bob builds a website allowing any person to use the software by way of a few clicks. The software is not included in the code that is delivered to the user's web browser. Rather, it runs deep in the woods on the server side on-demand. Bob starts charging money for the service.
Is Bob required to include X's copyright notice on the website? Is the website a "copy" or "substantial portion" of software X?
If the answer is "Yes" and Bob ignores it, how much money the copyright holders could potentially win by taking Bob to the court?