I have used them as reverse proxies to have re-direct slack messages to the Firebase project (we use one Firebase project per environment).

Also used them to return images from different providers, and resize them, on a single endpoint.

Plus, if you decide to pay a premium (but still often cheaper than lambda), they can run for just as much time.

All that’s actually missing here, for me, is the triggering mechanisms and integrations with services like S3, SNS, DynamoDB, etc.