How much does it cost to run a dApp?

Can you provide a general idea of the cost associated with operating a decentralized application, or dApp? Are there specific factors that can significantly impact the cost, such as the complexity of the dApp, the amount of transactions it processes, or the platform it's built on? Additionally, are there any recurring costs that need to be considered, and are there any tools or resources available to help estimate these costs in advance? Understanding these factors can help potential developers make informed decisions about whether to pursue building a dApp.