I really liked the sound of Crashlytics. Then Twitter bought it. Now it's free. I don't trust Twitter and I don't trust free, so I'm less likely to use this. I

I really liked the sound of Crashlytics. Then Twitter bought it. Now it's free. I don't trust Twitter and I don't trust free, so I'm less likely to use this. If I don't understand why something is free, I grow suspicious. I want to know how a company plans to make money before I sign up for its services.