In this case in particular, their stuff was under MPL (which has copyleft). If there were other companies offering Hashicorp services with hasicorp software, they also are under the obligation to open-source their changes under the MPL to their users, so hashicorp could get back those "contributions" from "freeloaders".

On the other hand, many contributions(PRs) that hashicorp got (for free) are now relicensed to a different license. Who's actually the freeloader here?