I spent the last year building an in-house, Kubernetes based PAAS that has a lot of similar functionality. What we don't do, however, is support multiple execution environments -- we're tightly coupled to Kubernetes.
The fact that it's OSS makes it a compelling starting point for other organizations who are beginning their own in-house PAAS efforts (or restarting them). If I were starting over I'd definitely dig into this before deciding to roll my own.
I know I'm certainly going to need to make some time to learn more about Waypoint. It might be too much pain to migrate to, as our in-house system is pretty mature -- but it'll at the very least serve as a source of inspiration. NIce work!
Do you know how you plan to monetize this in the long-run? I assume it's via a managed offering, where the end-user isn't responsible for hosting the software themselves and instead pays a monthly rate (or pays per use). Knowing what that trajectory looks like we help me feel more comfortable using it, as it'd clarify how it will / will not change.