I think if one wanted a very cut and dry indication of COVER markedly improved or is much better than Niji all you have to do is look at the almost back to back terminations of Mel and Selen
Mel was terminated suddenly due to her seemingly leaking work to someone else, a pretty serious offence if true, and so far we have not really gotten a confirmation of that being false, or true either
Cover, gave her a chance to say goodbye, had members post favorably about her, and iirc even Yagoo said Farewell. I think A-chan was one of the first to post saying her goodbye
Selen bears no real explanation for most, but we had nothing for weeks, management skinwalked her tweets, she almost offed herself, all of that because they seemingly lost a cover in some wierd burocratic limbo and she went menhera after it got pulled. The only actual answer we got about that cover was that they had to check the characters in the cover itself, the characters cameoing in it? All of them were Niji IP, just graduated livers, something we have precedent over atleast allowing their images to be depicted. Her termination message implying that she did much worse and her response to that was supposed to be the cherry on top of her almost offing herself, but then they doubled down with the black screen video, airing out more of the behind the scenes legal proceedings. Involving livers into it publicly, etc etc
Point is, Cover is still seemingly leaps and bounds ahead of anycolor in some of these statements, and have given alot of people reasons to trust their word even when its still a random japanese corpo, people are going to err on the side of Cover not being incredibly incompetent as a whole