I believe we could explore working with one or more 3rd parties to build such a tool; it would be in the clear interests of performance analysers, cloud providers, Microsoft, chipmakers etc to build something and have visibility with a fairly top flight group of developers.
A previous question on whether TIO was adequate for performance challenges was fairly conclusive that it wasn't, and that there wasn't an easy alternative. Having a communal tool would also resolve the gnarly problems of performance competitions.
In terms of function, I would imagine at least initially a lang/VM-specific challenge format, e.g. single-threaded Python, parallel C++/native via xyz libraries, or JVM; it may be sensible for different 3rd parties to provide different environments matching their commercial focus. As a minimum, a company could in theory provide for a specific scenario as a microservice to TIO if that was acceptable to everyone.
If there is support here, I am happy to make contact with essentially anyone on the perf analysis radar in that light. If they could work with (maybe sponsor?) TIO as well, that might help pay back a debt to Dennis and simultaneously make the tool relevant, given how perfect the TIO fit is for PPCG questions.