Cardano was designed with the intent of long-term sustainability in mind. The goal was to build a system that could govern and fund itself without relying on donations. Cardano includes a built-in treasury system that receives revenue via transaction fees and treasury taxes on a regular basis. This is explained in detail in treasuries with Bingsheng Zhang.
Cardano Improvement Proposal
Cardano Improvement Proposals (CIPs) are a way of formally proposing ideas in an agreed-upon fashion. While they are not binding and are not a need for either treasury or protocol changes, they are an important component of Cardano governance. Someone must propose a setup for others to discuss before a decision can be made.
Fund your project with Project Catalyst
The present means to access the funds of the treasury system is through Project Catalyst, Cardano's innovation platform. It is considered as a stepping stone to Voltaire and strives to give a safe and exciting setting in which to explore human collaboration's highest potential.