ONNX and OpenVino hubs are designed to make models built by other people load / work using "1 line" of code with a semblance of everything being done properly in legal terms, but there is very little incentive for model creators to share models there.
TF and Torch hubs may actually help with discovery and they are low-maintenance.
All of this is kind obvious, if you compare my conclusions with strategies of companies maintaining these, especially the no-GPL mumo-jumbo by Intel.