https://lilyspeech.com/lilyspeech-free-version/The free version of LilySpeech is made possible by doing market research in the background ... examples:
Checking and verifying websites positions in search engines for different search terms
Ad placement verification
Competition price checking
Website uptime monitoring
Reading through the vague, nothing-speak license, I think it basically I think it does some research on your computer that looks legitimate and not like some a specific company digging for info. I have read that some websites will jack up their prices if they think you are price matching (via watching 3rd party cookies), but I don't know the status of that or if this program would create issues like that.
More to the point, I expect to see more programs with this kind of payment model in the future.