Didnt even touch it.
Not sure I care enough. It depends on what they give us in return. I remember there was a collab back in the day for FKG and some other game, that was so bad that most FKG players didnt even attempt it (something like a 4* Silver rarity ticket or joke like that > thats a 3* in AB terms, so yeah...).

If the Collab is worth it I might give it a go, but Attack on Moe doesnt strike me interesting enough to devote my time for a "maybe" reward.