Every role contributes to further development of Web3 interoperability in their own way.
Model Providers are generally platforms that have been working on reputation assessment within their systems. If that describes your system, you can join the Orange ecosystem and make your models accessible to others.
Data Providers could be systems with data that has utility outside its native environment. Generating datasets and making them accessible via an interface to be used as input for modles is a great way to leverage the inherent cross-chain benefits of composability that blockchain brings.
dApps are the primary players who use the public modles and datasets to generate reputation for their users. If you're working on a dApp and want to implement a decentralized reputation mechanism, you can go ahead and integrate Orange to your system using this SDK here.