Two tweets by the union "Industrial Workers of the World" (from2020) reminding furries that they have a place in the worker movement: Fursuit makers can join the Textile and Leather Workers, artists can join the Printing and Publishing Workers.
There's still good reasons to join a union! Most importantly, unions advocate for their industry in government, which will benefit everyone regardless. Many will also offer direct benefits such as special discounts, but that'll depend on each union. Mine, for example, offers a discount on AT&T phone plans and even a union credit card.