Trust come from reputation. There are some legendary members with no reputation within the sphere of project management, bounty management, community management etc. Others may even have negative trust on the forum. I will only trust a legendary member who announces a project if the member meets all of the above.
You only have to trust yourself. The information you have accumulated over time on the crypto market must be the foundation in which you make a decision. You invest your money, so the decision must be yours. It is true that an announcement posted by a person with a rank on this forum by the Legendary Member, deserves more attention, but this does not guarantee the success of the project. Choosing the right project is the result of your knowledge.