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Is there any particular reason why we are seeing so many touhou 'extractons' by different artists? A competition perhaps?
Yes, pixiv started a competition which let artist share the high-res(350dpi+)-transparent-background illustrations, these extractions are all for the Touhou event "例大祭7".
The official pixiv competition is running from 12/18~1/17. All of them will be displayed at 例大祭7, and some of them will be compiled as an pixiv official artbook.
There are some good/bad ones, but once again I'm surprised by the amount of artists who can't draw feet or shoes.