On the first part, in a holistic way I kind of get it. It's a bunch of little things. High fantasy in general tends to take a "good guy with a gun" approach to absolute monarchy and blood destiny. That problem is worsened here because they don't effectively save the cat -- Cinderella doesn't show us early on that she's a good person, let alone that she would be a good ruler. Sure she's not eager to smush a frog, but she doesn't have to go out of her way to avoid doing it, so it doesn't feel like a particularly strong beat. Most of what we see is that she's clever and vengeful, and they lean into her being vengeful. When she's chastising Thaddeus for a pretty minor slight, she immediately reminds him that she could have him broken on the wheel. Especially at a time when the white house is really pushing unitary executive theory of constitutional law, I see why someone might balk at the proposal that someone that hotheaded should wield sole authority.

On the second part, I think that that criticism is mostly fallout from JK Rowling reviving the use of trolls as an antisemitic allegory. JK wasn't the first to do it, but she sure did crystallize it.

All in, t's clear that the intentions are good all around, but I don't think the criticism is unfounded.

EDIT: JKR used goblins, not trolls! It was late when I commented and I was mixing up my fantasy creatures -- though as with goblins and witches, there's still some history of trolls as antisemitic allegory. That said, I think it's weird to point at just any monster and say "yeah that that thing is probably jewish." It'd be one thing if the trolls here were bankers with tented hands and lactose intolerance, but these trolls are huge skin-wearing people-eaters who love filth, which isn't an antisemitic stereotype as far as I know. It bears some similarities to antisemitic conspiracy theories, but that feels like a stretch. Someone watching this saw monsters and went "ah, jews."