What DeltaMath's terms say
DeltaMath's terms of service and privacy policy have 11 rated points: 0 serious, 4 bad, 3 worth knowing and 4 good. 10 apply whenever you use the site, signed in or not; 1 only once you have an account.
Whenever you use DeltaMath
Bad 3
Many different types of personal data are collected
Where it says this ↗Third-party cookies are used for statistics
Where it says this ↗A secure, anonymized record of your data may be kept for analytical purposes after the data retention period ends
The service may keep a secure, anonymized record of your data for analytical purposes even after the data retention period
Where it says this ↗
Worth knowing 3
Your IP address is collected, which can be used to view your approximate location
Where it says this ↗This service gives your personal data to third parties involved in its operation
Where it says this ↗Third parties are involved in operating the service
Where it says this ↗
Good 4
Your personal data is used for limited purposes
Where it says this ↗Information is provided about security practices
Where it says this ↗This service claims that your personal data is not being sold
Your personal data is not sold
Where it says this ↗Promises will be kept after a merger or acquisition
Where it says this ↗
If you have a DeltaMath account
Bad 1
Your account can be deleted or permanently suspended without prior notice and without a reason
Your account can be deleted without prior notice and without a reason
Where it says this ↗
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.