It's a nice spin of cloud providers to use "serverless" as a euphemism for "runs only on our proprietary platform and is virtually impossible to migrate away from".
It really depends on how you use it. If you structure your code well and you mostly use it to build RESTful APIs (which is what dawson is meant for), you will be able to easily migrate it to any other system. Especially if you use Lambda + RDS, you won't need too much work to re-deploy the same database and functions elsewhere (either another serverless vendor or your own infrastructure).
