S3 recently added basic matching support (https://aws.amazon.com/about-aws/whats-new/2024/08/amazon-s3..., https://docs.aws.amazon.com/AmazonS3/latest/userguide/condit...).

They don't have the full suite of GCS's capabilities (https://cloud.google.com/storage/docs/request-preconditions#...) but it's something.