A lot of those same companies have issues with files stored off premises.
Of course they do! But rules are too strict, so everybody needs to play outside sometimes in order to achieve something. So as long as there is access to personal email there will be files stored off premises. Rhino in the browser might actually decrease their problem.
With RhinoWIP I can’t login on fra.me. Login opens another tab in the local browser not on the cloud computer browser.