I did hear something on the radio (which is probably the least appealing source but I'm sure you can find others) suggesting it was inflammation of a part of the brain and similar to chronic fatigue

https://www.abc.net.au/triplej/programs/hack/hack/102079376 this was the show

I get it but I worry it'll limit the success of Lemmy. Reddit's drawcard was finding THE sub for a topic, if the same discussion is fractured across many different indistinguishable ones it'll be like a bunch of random small chat groups which is something that already exists. Also means that maybe you'll be subbed to the "fediverse" sub that sucks and not realise there's a more established one you don't know about.