Framework is looking for Linux Community Ambassadors! We are looking for active members of the Linux community who frequently visit Linux and open-source events throughout the year to help us connect with the larger Linux community. Our volunteer ambassadors will attend local Linux and open-source events, meet with other Framework laptop users and potential community members, answer questions, gather feedback, and showcase Framework laptops and parts to those interested. Ambassadors will be in...
“Volunteers” are unpaid by the definition.
It seems like OP wants to stress this.
Not always, in military contexts it’s used to differentiate between conscripted and those who voluntarily applied.