p.s. Just to make clear what this list is for:

This isn't a list of all the hashtags people should use, because most of them are obvious and don't need a guide. Something like #Gardening is obvious and there's no need for anyone to tell you about it.

The point of this list is for unusual tags which aren't obvious. Things like #LichenSubscribe or #Florespondence aren't tags you could guess the existence of, you would have to be told about them. That's the point of this list.