It started as a side-project and still is. I'm the creator of the service and my day job is as a web developer at Mozilla.

If this service becomes surprisingly popular I'll look into ways to monetize but that's unlikely to be the case unless I'm really really lucky.

The origin of building this is that I found a cool prototype of the concept in a blog post, then threw that into my own site and later realized I want to re-use that for a (day)work site. So I though instead of copying it, I'll write a microservice.