Movies Anywhere doesn't stream in 4K, anywhere - pretty sure that's correct!
Yes you are right. Movies Anywhere does not stream in 4k. However, I was thinking about workaround. LG OLED TV's have the LG Tru 4k Engine Pro built-in which attempts to upscale anything that's not streaming in 4k through the TV to 4k. The conversion is live and seemless as you watch whatever you are watching. If the TV had a Movies Anywhere app, I'm thinking the non-4K movies would get upscaled when watched.