Your follower counts determine how many credits you earn as you share content within the VCB dashboard.
As you earn credits by sharing, you build up a “bank”
When you submit your own project to VCB, you’ll need to allocate some or all of your credits to this project (you call it “budget” although I think “pool” is more reflective of what it is)
VCB members share your content, which earns them content from the pool you’ve allocated to your project. Remember that their follower count allows them to earn higher amounts of credits as they share, but this is okay; you’re willing to give up 5 credits for a tweet from someone with 100,000 followers, while a share from someone with 500 followers only costs you 1 credit.
If your content goes so viral that you run out of credits in the pool for that project, the project is paused until you allocate more using credits you’ve earned yourself from sharing other members’ posts.