Hi.
As you know, currently there is no other way to verify age other just with a credit card.
For this reason, we need to ask eBay to change something here.
The best I can think of is, write a complaint.
Go to
https://www.ebay.co.uk/help/selling/getting-paid/file-complaint-ebay-commerce-uk-limited-payments-cr...
Then you will be redirected to Contact Us. Then it will be a live chat with a bot and ask to write a complaint. Then the bot will suggest that the support team call you in a few minutes. Please accept and confirm your phone number. When they ring, just explain that all you want to do is write a complaint. And a person will ask to send your message. Say that this is not acceptable, that is only one form of age verification, and explain why, explain that not everyone has a credit card, for example, s student or a card never used and expired, or any other reason why a credit card is not available. Please add more weight on top.
If you know another form of age verification that eBay could use, suggest it at the same time, please.
Thank you for raising a complaint.