Neos was the only platform that had any real chance at competing simply because it is nothing like VRC. And then it's not real competition since its target audience is different to begin with. Cluster also survives and thrives simply because it's targeting completely different audience.
Anything that's clone of "existing popular service X with established userbase" has to be MASSIVELY better to have any chance at dragging users over, if it's more or less the same just slightly better but without the established userbase nobody will move, ever, because friend stays there because friend stays there because friend etc., it's catch 22 situation.