It's still a commercial operation according to the FAA. The legal term is "holding out" and is described in AC120-12a .Am I a HOBBYIST or operating COMMERCIALLY (subject to 333 exemption and pilots license rules)?
From the Advisory Circular:
For example, the expression of willingness to all customers with whom contact is made that the operator can and will perform the requested service is sufficient. The fact that the holding out generates little success is of no consequence. The nature and character of the operation are the important issue.
There are lots of ways to "hold out", but the basic idea is if someone in the general public comes to you and asks you to fly [for] them and you agree, you are probably holding out. Any form of advertising demonstrates a clear sign that you are holding out.