The search for a geometry dash free apple id is understandable—everyone loves free stuff. But the iOS ecosystem is designed to prevent account sharing. The "free IDs" floating around forums are either expired, fake, or booby-trapped with malware.
Some people share Apple ID accounts that have already purchased Geometry Dash.
Using a "free Apple ID" to get Geometry Dash is a high-risk method that often leads to account theft or device lockouts. While the prospect of skipping the $3.99 purchase fee is tempting, the security trade-offs are significant.