Yeah, as a lot of people have noted, this really isn't "how big are your fandoms" so much as "how big are your fandoms on AO3," and for old and perennially popular fandoms like LotR the latter isn't a good reflection of the former. I'd also imagine it's not a good reflection of fandom size for MDZS or TGCF, either, since Chinese-language fandom mostly isn't on AO3.
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Yeah, as a lot of people have noted, this really isn't "how big are your fandoms" so much as "how big are your fandoms on AO3," and for old and perennially popular fandoms like LotR the latter isn't a good reflection of the former. I'd also imagine it's not a good reflection of fandom size for MDZS or TGCF, either, since Chinese-language fandom mostly isn't on AO3.
I'd love to see you do it! It's a fun meme.