What you should avoid

Avoid applications that have the following features:

• CPU-intensive with long running tasks
• Constant and with predictable traffic
• Real-time processing
• Multiplayer-intensive games

Regarding multiplayer games, you can build a serverless backend that handles the communication between players with very low latency through serverless notifications. It enables turn-based and card games, but may not fit so well for first person shooters, for example, which require constant and frequent server-side processing.