Not delusional. The rsync.net supports low-level tools like scp, and also this. And their team is great for engineer level questions.

That's wonderful! Full endorsement of the support of rsync.net.

I sincerely doubt most tools will be supported by most providers (by usage), however, and I question the evaluation of tools by this metric. Support is generally a fairly bad metric by which to evaluate tooling—generally speaking, if you care which client is consuming an API someone has done something horrifically wrong.

Wot? Support is THE metric.

...for the client tooling, or for the service? The service is understandable but the tooling makes no sense whatsoever.