This is an awesome value proposition. Congratulations on launching!
I have a project that I've been dreading on how I would tackle its background processing. It is a long-running process that should start and scale based on a user starting his work. I'm AWS certified and still wasn't thrilled about setting this up. Defer would solve this for me.
I can see myself suggesting this solution to clients who want to run complex jobs without the hassle from cloud infra.