I wonder if providers like Hetzner and Digital Ocean etc. will get this someday also.
DO has Nested Virtualization enabled for years.
[1] https://status.hetzner.com/incident/7fae9cca-b38c-4154-8a27-...
Alternatively, you can check out magic wormhole (for a more secure transfer of files between two terminals): https://magic-wormhole.readthedocs.io/en/latest/welcome.html...
There are sone public instances too: