I love such low value many words responses! If you have no plans to charge for the service but still provide it as a service instead of making it an offline tool, then it's even bigger NO.

We, some users, find that when there is no price for the service then we're paying with our data. It may be sold or used in unintended ways. It should be mentioned somewhere in ToS what you're going to do with the data, right? Oh wait, there is no ToS...