A big issue here, especially with the MCU stuff, is that it's not a skin color thing with those changes. They updated the whole character in order to make them into races that are more friendly to China. They've done this repeatedly and stripped identities and character traits from characters over and over again.

Every single Romani character that's appeared in an MCU movie has had their heritage removed and replaced with generic white. Scarlet Witch and Quicksilver are good examples (since they're the ones in the meme) but I don't see any way that Robert Downey Jr is going to be able to do the complicated Romani backstory of Dr Doom very well.

I agree that Ariel was swapped for marketing reasons (and arguably specifically to cause outrage and get people talking) Ariel doesn't have a racial heritage that plays into her life and identity... She's a mermaid from the sea... Not a member of a group with a large history of being discriminated against.