I think the “not applicable” is to the elided second sentence of the question:

> 3.6. Have you communicated with any of the entities whose products or services might be affected by the introduction of your proposed service? [→ No.] If so, please describe the communications. [→ Not applicable.]

Gotta say that the entire form feels not applicable. The proposed service is the discontinuation of an existing service. I see from their website that other similar things do the same, but it feels broken when so many of the questions become nonsense.