Use case: Can I disallow competitors from accessing my offers?

Yes, you have options to automate the fulfillment process for registrations from potential competitors. You might not be able to eliminate the problem but you can definitely make it harder for competitors. Here is the option.
1. Go to Admin->Inbound Registration Filter
2. On the configuration screen enable the following options:

a. Enable the inbound registration filter.
b. Apply registration filter on email domains and company domains.
c. Setup a global sorry page using topics and enter the pretty URL on this screen
d. upload a CSV file with a list of email domains and company names that you want the system to automatically filter out.