You do not need to run your own node to interact with the POA blockchain (play games, send and receive funds, and use DApps). Running a node can be thought of as a public service - it benefits the decentralization and overall security of the chain, and allows you to confirm the chain state using your own instance.

Note: While OE still works fine with POA network, it will be deprecated in the future. Nethermind is the recommended client for new installations.