When I was a consultant, I sat in on a lot of meetings at startups who were getting near the end of their runway. So many of them talked a good game about privacy, but when they couldn't find enough revenue, they at least talked about selling user data. The main argument against it was not that it was unethical, or that they'd told users they wouldn't do it, it was that they didn't have enough users to make it worthwhile. Since then, I just do not trust any company not to keep, process, and sell my data, no matter what their nominal values or privacy policy says.