The Monthly+ pass that an employee buys from Hussle grants them access to participating venues. To be considered a gym's 'direct member' would normally require the customer to have signed through them and paying them a direct debit directly.
Although a Hussle member may not get full membership perks (which is at the gym's discretion), it does mean that employees won't pay joining fees nor are they tied into long contracts, both which can occur if they joined the gym directly. Additionally, if an employee had a direct membership with one gym, they wouldn't be able to visit multiple venues like they can with the Hussle pass.