This trust is usually formed by the community who feel the need for the platform and also from the dev that continues to innovate for its users who feel comfortable and safe. thus a sense of trust will continue to increase on that platform
If its new platform and no reviews yet, better do research or don't input unnecessary details, or your true identity. I:ll better wait for some review before putting risk my money and identity.
To avoid any possibilities of being hacked or scammed, it's needed to do the research thing in order to understand the potentials and the security of your assets and your identity as well, new platform always have good promises so it's always best for end users to make their own review before letting to yourself to join and invest with your assets.