Also, as a business, don't allow an employee to buy something at their own expense and use it for your business. One place I worked an employee bought a domain

Also, as a business, don't allow an employee to buy something at their own expense and use it for your business. One place I worked an employee bought a domain for a particular marketing promotion. Promotion was successful, and the site grew into a life of its own, and was even promoted from the main product. The domain showed up on Google search results, etc. The company had lots of users but wasn't too successful financially, and a few employees including that one were laid off. Six months later the domain suddenly pointed to the new product that person created after leaving the company. We removed the links from our product to that site, but other than that there wasn't a great deal we could do.