Trust as a term is a bit overloaded. For software teams, I find “trust” can often be a shared lingo, shared mental model, and shared expectations. The first two can be easier if the two sides both use the same programming language and internal libraries. The latter can be hard, especially if the two sides have different Product Managers.

The OP alludes to ‘what trust is’ mentioning the ‘Dario simulator’ issue. Trouble arises when ‘the Dario’ holds a vision that might conflict with the team or the outside world.