Should digital platforms be allowed to charge fees to workers to work? If ordinary rules were clearly applied to platform work, the answer would be a resounding “No”. Workers should, in theory, never be charged to get work. This norm stems directly from the principle that “labour is not a commodity”, a founding tenet of the International Labour Organisation. Asking money to allow people working as you would ask the trader of a certain good to pay to accede to a specific market (e.g. listing stocks in the stock exchange) is an evident commodification of someone’s labour.

http://regulatingforglobalization.com/2019/07/03/time-to-stop-platforms-from-charging-recruitment-fees-to-workers/