Pownce, Convore, Grove, all shared similar fates, I think its more indicative of the founder not the business.
Makes less sense to blame the people, rather than lay blame to what they did (or did not) do.
It sounds to me like you are judging the founder. Not that I would disagree with you.
Don't get me wrong, I think Leah is awesome. She just builds up companies for soft landings/aquihires and pockets some money along the way. There is no reason a viable company couldn't exist on the grove model.