but it does sound a bit like Ebay taking away my freedom to bid however I want.

LOL. Does anyone else remember when the word "freedom" had real meaning? Do you think that we could avoid debasing it any more?
Bidding on Ebay is a privilege granted to you by Ebay, and not a right. As such, you are allowed to bid exactly as their rules and regulations permit, for as long as they deign to grant you that privilege. That isn't Freedom.

"I Pledge Allegiance to the flag of the United States of America
and to the Republic for which it stands, one Nation under God,
indivisible, with liberty, justice, and the right to bid freely on Ebay for all."