I was wary about nominating pairings in the MCU because I know most of them have waaay too much fic written to be rarepairs (less than 1,000 fics on AO3). In fact, I checked for my favourite MCU pairing that I wanted to nom and it was over 1000 fics by a fair bit. However, I see now that James "Rhodey" Rhodes/Tony Stark (which has nearly 2000 fics) and Steve Rogers/Natasha Romanov (which has close to 5000 fics) have been accepted, so now I'm not sure if I've misunderstood something?