Often, investors dictate their terms and partly justified actions. In many projects on this ground there is a misunderstanding and thus hinders progress in the project.
I'm not really sure that investors can sufficiently control the development of the project. A lot can stay inside the team.
You really can not force the team to try and succeed, but you can try to control the funds. Well it's not about VRT.
How can you as an investor control the funds? If the dev team doesn't agree to payments upon achieving milestones, what else can you do to have control over the funds?