Trust can be established from face to face, and no other form of communication comes close to it. My recommendation to people who are into remote is, once they take a Gig, if possible go to the physical office location and spend some time 2 to 5 days mostly meeting their team and esp. their boss face to face. Once the trust is established face to face, it will carry on to other forms of communication and will not diminish (if performance is good).