That's a good question, because this phrase in the ToS FAQ would seem to apply to liveblogging: "Ephemeral content is generally meant to be read at a particular time: for example, a message about a particular challenge or a reaction meant to be read while or just after a particular episode airs."
That said, I don't know as brief review posts that aren't liveblogged are much different other than in style. It's pretty common that people comment on elements of an episode without doing a comprehensive review. (Similarly, a recap is not a transcript but it's also more of a wiki doc).
I guess the answer is that the MMM Challenge is not the arbiter of what AO3 allows, other than sharing what they've made public about it. If you want to check with them and let us know, that would be helpful!
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That said, I don't know as brief review posts that aren't liveblogged are much different other than in style. It's pretty common that people comment on elements of an episode without doing a comprehensive review. (Similarly, a recap is not a transcript but it's also more of a wiki doc).
I guess the answer is that the MMM Challenge is not the arbiter of what AO3 allows, other than sharing what they've made public about it. If you want to check with them and let us know, that would be helpful!