I think companies can be relays. For example here are some relays in Jumble UI and then one relay selected. That could be an example company relay instead, with the company posts and approved posts from others, basically like a Facebook group or Page (versus a profile). In fact I think keypair management is too hard for most companies, with employees changing all the time and a max aversion to risk. Having companies as relays makes access management as easy as managing any other part of the company's IT infrastructure.