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PrivateLink is a characteristic of a VPC Endpoint. You could deny they ec2:CreateVpcEndpoint action in your SCP statement but that might be too restrictive for what you need.
Have you looked at adding a deny for ec2:VPCEndpointServicePermissions?
There is also the StartVpcEndpointServicePrivateDnsVerification action.
Hello,
Is there a specific reason you want to use SCP to achieve this?
It can be easily achieved by a native feature of PrivateLink where you explicitly need to allow the external (consumer) account's endpoint to connect to the (provider) account's endpoint service.
Manage permissions:
The combination of permissions and acceptance settings help you control which service consumers (AWS principals) can access your endpoint service. For example, you can grant permissions to specific principals that you trust and automatically accept all connection requests, or you can grant permissions to a wider group of principals and manually accept specific connection requests that you trust.
By default, your endpoint service is not available to service consumers.
You must add permissions that allow specific AWS accounts, IAM users, and IAM roles to create an interface VPC endpoint to connect to your endpoint service. To add permissions for an AWS principal, you need its Amazon Resource Name (ARN).
ARNs for AWS principals
AWS account (includes all principals in the account)
arn:aws:iam::account_id:root
IAM user
arn:aws:iam::account_id:user/user_name
IAM role
arn:aws:iam::account_id:role/role_name
All principals in all AWS accounts
*
Consideration
If you grant everyone permission to access the endpoint service and configure the endpoint service to accept all requests, your load balancer will be public even if it has no public IP address.
Unauthorized customers can create an endpoint service and grant "*" to users in the organization to implement cross-account data access, which is unbearable for organizations.
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This can only control the behavior of the endpoint service, not the endpoint.