There are platforms and agencies that sell or provide an access of a single lead to way more than just one contractor.
Exclusive leads are typical for larger buyers and are more expensive than shared leads. But there are not always too many options to request exclusivity from an agency or a platform.
Exclusive lead programs are definitely available to the world's largest companies, designed to execute strategies to guarantee the uniqueness and exclusivity of leads. Because they have budgets to pay more.
In other cases, you should concentrate on lead generation efforts.