Service Tracking DuckDuckGo
Does the service use first-party and/or third-party cookies?
Can they change the terms at any time?
Do they claim copyright (or what sort of license) over your content (where applicable)?
Do you have a right to leave the service?
Can you export your data (where applicable)?
How do they work with third parties (contractors they use)?
How do they work with government requests?
How do they handle decisions about suspension of your account when they feel you breached the terms?
Do they (try to) prohibit you from going to court against them?
What happens to your data when they get acquired or when they shut down the service?
How long do they keep your private data and what do they use it for?