From the private dev subforum, but I'm sure Droosk won't mind all that much. Droosk is certainly one of the more knowledgeable devs about the topic (and a big reason why so many AVNs are moving to Steam now):
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So, the devs who are using that as a reason to not put out public releases are likely misunderstanding what's being said. Not that I blame them for it, Steam's legalese and vagueness make it fairly easy to do.
Or if I were looking at it more cynically, it'd be a reason for devs to no longer put out a free version and thus likely make more from people who want it (e.g. [redacted] being banned here, so players were forced to use SS to get the game, thus more money.) sooner instead of waiting for someone to leak it.