In general, we ask folks to share reproducible example data with a small reprex, (using something like datapasta or dput)
For situations that really call for you to share a larger file, we ask you to do so by sharing a file with something like google-drive, dropbox, box, onedrive. RStudio.Cloud may also be a good place to build and share your reproducible example, via a public project.
Right now the concern with offering the ability to share these kinds of files on community.rstudio.com has to do with; demotivating folks to create a minimal reprex, and to limit the storage requirements for the site. If we do offer some kind of data hosting, we'll likely rely on rstudio.cloud's infrastructure.
On datapasta.