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Unlikely. The "loophole" GCP patched was that you can use GCS to transfer data between regions on the same continent for free. This is already non-free on AWS. What OP mentioned is that transferring data between availability zones *in the same region* also costs $0.02 per GB and can be worked around.

I know of a way to get data out of GCP for free, although I haven't tried it in practice. Wonder if I could find a buyer for this info ;)

I got one for Azure, where it would be nearly free to egress data from Azure to any other cloud provider or the internet.

It works, but i have no use case for it. 100TB egress to the internet costs about 7000$ ... i think, i could do it for 20$-50$.

A guess: tunnel through 169.254.169.254 DNS server?

It's a good guess, but what I have in mind would have high bandwidth.

This doesn't feel like a loophole though, it feels like they have optimized S3 and intend your EC2 instances to use S3 as storage. But maybe not as transfer window, that is, they expect you to put and leave your data on there.