how this compares to a spreadsheet CSV import tool such as the one in Excel which is extremely flexible.

I would say the data loading functionality compares very poorly to Excel CSV import for all the reasons you pointed out, and I agree that the users can face those formatting issues which could be resolved in another tool like Excel or Google Spreadsheet for non-technical users and Notepad++ or editors for a bit more technical users. The assumption on CSV files being clean is strong so I will try to surface import errors at least, and in the meantime point to different ways to format the data as those tools will be complementary to Visprex.

To me, this implies that no steps have been taken to manage user/data privacy.

This is a good point. I fixed the wording and now it simply reads "No tracking or analytics software is used". Thanks!