[chc]

> I had the impression that LCS players were only disallowed from streaming those games if their stream advertised League of Legends content.

They're not allowed to stream those games if they have any affiliation with Riot.

> This ban seems to target other games that could be competitive e-sports, specifically the new Blizzard game Hearthstone.

It does lean that way, though I'm not sure there's much of a danger of Warcraft: Orcs & Humans becoming a competitive e-sport.