With these cases of staff and temp-staff doing these things, despite there being some transparency, I think it calls back the question of "Should GM's have alts?". The argument for it is it is a game they need to enjoy too, but I believe it presents the temptation to do these things. We see the recent case, and cases in the past with GM's giving their Alts rivals stat builds of their enemies, and we see relatively meh characters go from character to alt and suddenly the world is theirs. Saying that they would just get attached to an NPC and do the same thing is also a weak argument. If you set fourth standards then you should be expected to follow them or not be on staff.
It is a simple solution, put your character into a vacation state, and focus on your GM duty when you become a GM. Enact term limits so that you have to return to the game as a normal player and not sit as a privileged moo-god your entire time in Sindome and maybe they will appreciate it a bit more or keep staff from obtaining the cerb-think mentality. Thank you for volunteering to keep the game running, but don't expect everyone to feel sorry for you and dismiss things that you do as a volunteer.
It's also noteworthy to mention that it was a SUPPORT GM who for years went unchecked, so obviously the limitations are not enough to prevent cheating. When players notice something is off, the impression that staff have something similar to the thin blue line and everyone needs to back the blue and trust that "you don't see everything " is the end all be all, is a real shitty way of driving off players who were wronged. It would be much better for the game to remove the temptation to cheat by removing alts. If a support gm can do it, imagine how many (and there have been) GM's that get away with it.
I'd like to add that I personally have been invited to GM after being passed over several times when applying. In the end I decided that enjoying the game as a player, and GM'ing were not mutually exclusive things for me and respectfully declined. While that may not be the right choice for everyone, ignoring the fact that it is definitely a thing would be neglectful at best