Aliasing:
free_art → invalid_tag
freebies → invalid_tag
Link to alias

Reason:

I don't see how these tags could be beneficial.
This kind of info can go in the description.

EDIT: The tag alias free_art -> invalid_tag (forum #277643) has been approved by @Millcore.

+1. It also kinda comes off like an advertising tag.

The tag alias free_art -> invalid_tag (forum #277643) has been approved by @Millcore.