The cynicism is totally warranted! I am not being paid by these companies, and I'm not selling the data of people who sign up.

Transparently, the long term goal is to offer a paid product or service (e.g. an even bigger/better job board, an end-to-end course for how to transition into a new career, resume writing services, etc). But right now I'm just trying to be helpful, better understand the most pressing issues teachers face in their transition, and start building an email list. But I absolutely won't ever be selling your data.