What eBay's terms say
eBay's terms of service and privacy policy have 20 rated points: 0 serious, 9 bad, 7 worth knowing and 4 good. 13 apply whenever you use the site, signed in or not; 7 only once you have an account.
Whenever you use eBay
Bad 6
You are tracked via web beacons, tracking pixels, browser fingerprinting, and/or device fingerprinting
The service may use tracking pixels, web beacons, browser fingerprinting, and/or device fingerprinting on users.
Where it says this ↗Your personal data is used to employ targeted third-party advertising
The service uses your personal data to employ targeted third-party advertising
Where it says this ↗Your data is processed and stored in a country that is less friendly to user privacy protection
Where it says this ↗This service shares your personal data with third parties that are not essential to its operation
This service shares your personal data with third parties that are not involved in its operation
Authorized service providers are simply third parties that eBay has chosen to share data with. Some of these can relate to eBay's operations, but others are not.
Where it says this ↗Third-party cookies are used for advertising
Where it says this ↗Many third parties are involved in operating the service
Where it says this ↗
Worth knowing 5
Failure to enforce any provision of the Terms of Service does not constitute a waiver of such provision
Where it says this ↗Blocking first-party cookies may limit your ability to use the service
Blocking first party cookies limits your ability to use some of the service
Where it says this ↗You agree not to use the service for illegal purposes
Users agree not to use the service for illegal purposes
Where it says this ↗Do Not Track (DNT) headers are ignored and you are tracked anyway even if you set this header
This service ignores the Do Not Track (DNT) header and tracks users anyway even if they set this header.
eBay does not respond to Do Not Track signals, but provides a notice for their use of Cookies (http://pages.ebay.com/help/account/cookies-web-beacons.html)
Where it says this ↗Invalidity of any portion of the Terms of Service does not entail invalidity of its remainder
Where it says this ↗
Good 2
You can opt out of targeted advertising
You can opt out of targeted advertising if you are in the European Economic Area (EEA)
Where it says this ↗
If you have a eBay account
Bad 3
Your content can be licensed to third parties
This service can license user content to third parties
Where it says this ↗Your account can be deleted or permanently suspended without prior notice and without a reason
The service can delete your account without prior notice and without a reason
Where it says this ↗A license is kept on user-generated content even after you close your account
This service keeps a license on user-generated content even after users close their accounts.
Where it says this ↗
Worth knowing 2
You are prohibited from sending chain letters, junk mail, spam or any unsolicited messages
This service prohibits users sending chain letters, junk mail, spam or any unsolicited messages.
Where it says this ↗Your content can be used by the service provider for all their existing and future services
This service can use your content for all their existing and future services
Where it says this ↗
Good 2
You can opt out of receiving promotional communications
You can opt out of promotional communications
Where it says this ↗The service has non-exclusive use of your content
Where it says this ↗
The documents
Ratings by ToS;DR volunteers; they can lag behind the current terms. Not legal advice.