What Zotero's terms say
Zotero's terms of service and privacy policy have 5 rated points: 0 serious, 1 bad, 2 worth knowing and 2 good. 5 apply whenever you use the site, signed in or not; 0 only once you have an account.
I have a Zotero account
I only visit it
Adds Zotero to your list and compares it with the other sites you use.
Signed in or not
Whenever you use Zotero
Bad 1
Your personal data may be disclosed to comply with government requests without notice to you
Worth knowing 2
Your IP address is collected, which can be used to view your approximate location
Third parties are involved in operating the service
Good 2
The service is released as free software or open-source
The service is open-source
This Service does not keep any logs
This Service does not keep any logs.
With an account
If you have a Zotero account
No account-only points rated.
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.