Depends on your use case. Certain parts of the app fit the bill really well.

Just yesterday i put the 'dnspython' module behind a google cloud function and all it took was 5 minutes and i had a REST interface to query MX records. It's great for small little use cases like that.

Another use case might be a simple webhook, where you're receiving pings from an external service and all the serverless function does is save it to a DB and maybe trigger another task for it.

In cases like this you can skip a lot of the devops boilerplate and reduce it a single file containing your function and perhaps a requirements.txt(or whatever manages your dependencies)