Any doubts can be resolved through auditing. As far as I know, almost all companies now attract auditors to test their smart contracts.
You're right. Traditionally, companies that make smart contracts order audits from two different firms. As a result, all errors are found and corrected at the development stage.
To a greater extent, this takes into account the views of investors. I think the project team is confident in its competencies and does not doubt its product.