I don't know, as a writer in the Loki/Tony ship I wouldn't say it's rare. In fact is was pretty prominent until Winter Soldier came out and Stucky took over the fandom, which then turned into the infamous Stucky/Stony/OT3 trifecta after Civil War.
More than rare I would say it's just old. It's had it's heydey during Avengers 1 and people moved on when there were more options. But people still read and write quite a bit of it. My updates only stay on the front page for two days or so, which is pretty active by most fandom's standards. It's like RDJ standing next to Evans and Hiddleston. Of course he looks small, he's standing next to f*cking giants. But 5'9" isn't that short.
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More than rare I would say it's just old. It's had it's heydey during Avengers 1 and people moved on when there were more options. But people still read and write quite a bit of it. My updates only stay on the front page for two days or so, which is pretty active by most fandom's standards. It's like RDJ standing next to Evans and Hiddleston. Of course he looks small, he's standing next to f*cking giants. But 5'9" isn't that short.