It's hard to accept anything is 'free' these days. "If it's free, you're the product", comes to mind. It's not ad revenue clearly (yet). Are we giving info to data brokers? Someone somewhere has to be making money off this.
I don't particularly care that I'm being exploited for revenue, but I do like to know how the exploitation is happening.
It's a very sad commentary on the world we live in that we can't just have something nice as a community without someone trying to make a buck, but it's certainly what we're used to.