What does "broken" mean here? If the development team is unresponsive, what do you expect H1's response to be?
That was a good way to keep companies honest, an implementation of responsible disclosure.
So H1 could implement that again. It doesn't get them a bounty but it does stop companies pretending reports don't exist, if that's what has happened here.
I think the conversation about whether H1 is problematic or not is a fine thing to have at the top of the thread. I can see people going either way on that question (bear in mind that it has as much to do with idiosyncrasies of each of H1's customers as it does with H1 themselves).