That's exactly right. We think most people will love the free tool for their personal use, and that many businesses will be willing to pay for End-to-End Encryption and CloudCache.
At first I believed that the revenue stream was like this:
1) ppl give their e-mail address
2) you scan the attachments (eg. words, subject etc).
3) you create a database
4) you sell the database to advertisers (that already have my e-mail address and can enrich their data).