The problem for media organisations with forum discussions (Lemmy, kbin, Reddit, actual forums) is that they have less control of the narrative. You need to employ (and provide mental health care) to moderators, which gets expensive quickly.

Mastodon (and other microblogs) are much more convenient because the publisher can dump their headline and blurb, but don’t need to maintain the discussion further. If a dog-pile happens, it doesn’t effect the original content.