I did this in the past because I had one project that took forever (reminds me, I sort of forgot about it above, I’m getting old…). Viki responded about 6-7 months after I sent the first inquiry about this matter, as talking to the CM was completely pointless. I can name more examples. One of my friends is currently working on a 40-episodes drama that was released in January 2022. The CM said that they don’t require help when other editors offered theirs, the CE didn’t edit a single episode since episode 15, but keeps releasing them with breaks in between (as there are at least some dedicated TEs). 9 out of 10 people are scared to report others to Viki since they fear to be ignored in the future by said CM, or they’re aware that Viki isn’t necessarily keeping things confidential either. It was similar with the matter of the “fake TE” you reported previously. When I commented on it, I received messages stating, “I would keep quiet, there are too many supporters, but I agree” or stuff like that.
People are scared to speak up. Not all of them, but a considerable number at least. 
English Editors have no limits, and you’re not obligated to add them as “English Moderators” either according to the Viki rules. But if restrained them, some projects probably wouldn’t be edited at all. The English editors who can cope with 20 projects at once keep the whole thing running after all. Some try to recruit new editors as well, but it’s not that easy. Only some can meet the requirements or have enough time.
This results in some “slow CEs” piling up lots of projects. However, they become even slower.
Certainly, this is a matter that can be solved by the community and by the CMs who have to recruit more people, set deadlines, find alternative solutions… but if we remember that a majority doesn’t dare to speak up it’d the same here. 
Viki’s last attempt to speed things up was the Viki Translation Editor (something that apparently failed: Viki as Translation Editors). So some people decided to edit shows on their own instead. But this may as well result in ignoring inaccurate subs due to not knowing the source language (well).
So I can somewhat understand that Viki might be worried to touch this matter. Especially, since I doubt they even ever understood how the contributor community works if we read their descriptions of English Editors in the Help Center.