github for data.
recently picked up using open science framework for group internal logfile sharing (nothing fancy, small datasets). that should work as a public bag dump as is, even for large amounts of data.
maybe osf could be talked into running marv within their site if the repository contains .bag files, just like a wiki comes with every repo on osf or github.
osf site: https://osf.io/
example repo: https://osf.io/re5wx/