Not having data which would incriminate you to a party which will misuse it is something of a pyrrhic victory, but I still see your point. It would be preferable to have no parties which would misuse this data, but if such a party does exist then you would be better off remaining anonymous. As with all risk analysis, there's no clear answer. Deciding whether or not using a service which tracks such data is a consideration of the convenience gained, sensitivity of the data, propensity of the parties in play to respect the privacy of this data, potential for future incrimination, etc.