The bulk update request #4841 is active.

create alias original_art (0) -> invalid_tag (0)
create alias originalart (0) -> invalid_tag (0)
create alias anthroart (0) -> anthro (3265730)
create alias ponyart (0) -> invalid_tag (0)
create alias crappy_art (0) -> invalid_tag (0)
create alias bad_art (0) -> invalid_tag (0)
create alias my_art (0) -> invalid_tag (0)
create alias myart (0) -> invalid_tag (0)
create alias requested_art (0) -> invalid_tag (0)
create alias digital-art (0) -> digital_media_(artwork) (1252074)
create alias sketch_art (0) -> sketch (144490)
create alias traditionalart (0) -> traditional_media_(artwork) (67348)
create alias commissionart (0) -> invalid_tag (0)

Reason: original_art seems to mean nothing at all. Bafflingly, some of the pieces it's tagged on are fanart.
Others are similarly useless and/or insulting (crappy_art, bad_art)
Some are typos, I just happened to find them while searching *art tags for this BUR.

EDIT: The bulk update request #4841 (forum #365864) has been approved by @gattonero2001.

Sadly, yeah. This is not remotely like the OC tag on Pixiv where it's pretty much always an artist's Own Creations in real meaning.

Edited to add a few more I found. They all have 10+ past uses, sometimes way more. In hindsight I guess I should've added this to topic #38349 but oh well. See that one for more.

The bulk update request #4841 (forum #365864) has been approved by @gattonero2001.