Having used Discord a fair bit, I don't know how well it would work as a discovery tool. Much like matrix you need to join or be invited to a Discord instance to have discussions there.

It serves the same purpose as Matrix, IRC, and to some degree these comments.

Discoverability will be easier with platforms like Mastadon, Twitter, Facebook (yuck) and maybe YouTube where people find things via algorithms and discovery features rather than having to know that something exists in the first place.

That said, if we want to "market" the show, the best thing anyone can do is actually recommend it to someone. If everyone who hears Ken (or Dave) read this comment on the June Community News were to *really* recommend HPR to one other person, that would go a very long way to providing some new ears and new voices.