I was dabbling with this last evening, and it occurred to me that there's one potential difficulty we face when attempting to investigate China-based RTO's. It's often really tough to identify them. The list I have that I mentioned yesterday came from a Bloomberg story back in early 2011. It was never exhaustive to begin with, because it didn't include AMEX issues, and absolutely ignored OTC issues, which are probably far more numerous. (ADR's are a relatively simple matter; BNY Mellon has a comprehensive list.)
It's very possible that the group of China-based RTO's that are involved in litigation actually form a very small subset of the entire universe of these issuers. Just no sure at this point how we work that out.