RiskShare is an innovative and robust platform for P2P risk sharing, leveraging several cutting-edge technologies to provide secure, efficient, and scalable operations.

Node.js is the choice for building the front and backend of the infrastructure, providing fast and reliable communication and data management between different components. Additionally, AWS Lambda is a powerful tool for executing smart contracts, providing an efficient and secure way to automate the risk sharing process.

The use of DynamoDB for storing data from the blockchain ensures that all transactions and interactions taking place within the network are logged, making it easy to keep track of everything that happens within the system. This feature is essential for maintaining transparency and accountability among all participants.

PayPal is a critical component of the RiskShare platform, providing a secure and efficient way to collect and distribute premiums and claims. The fully automatic collection process enables maximum scalability, handling millions of transactions without the need for additional manpower and systems. Moreover, the use of a private blockchain ensures that all transaction details are verifiable and secure, providing an additional layer of protection for all parties involved.

AI plays a crucial role in enhancing the efficiency and effectiveness of the described cloud infrastructure. Through AI-driven optimizations, the Node.js environment can be dynamically scaled based on demand, ensuring optimal performance for networking applications. AWS Lambda can leverage AI algorithms to intelligently allocate resources and prioritize the execution of smart contracts, streamlining the risk sharing process. Additionally, AI-powered analytics can be applied to the data stored in DynamoDB, extracting valuable insights from transaction records and network interactions, thereby enabling more informed decision-making for participants engaged in P2P risk sharing.

Overall, the combination of Node.js, AWS Lambda, DynamoDB, and PayPal enables the development of a decentralized and distributed system for sharing and managing data, which is essential for P2P risk sharing without the need for traditional insurers. The use of these technologies provides a secure, efficient, and scalable solution for managing financial risks, making RiskShare a promising platform for the future of risk management.