What if there existed some open-source "keylogger" that tracked and monitored everything you did on your desktop. It could provide a dashboard of every action you took. You could maybe edit the things you did or did not want recorded.
Then, if you wanted to get paid, you could sync your data up to some server. Your data would be anonymized and merged with data from all the other users of the service. 3rd party companies could pay to get access or insight for that treasure trove. Whenever that happens, the end-user is paid some small amount for their contribution.
Could it work?