Indeed, we've seen that happening very often. I lost count of how many times I've seen developers have a Slack or Discord channel to coordinate who's gonna using staging/dev and when.
Please let me know if you need any help setting it up. We'd love to help in any way we can.
One point i am curious about is the way you described you intend to make money, by providing a managed service. I am just thinking that if this service gets really liked by people, won't aws/gcp/azure create managed services out of this code and then it will be difficult for you to sell your services as most companies like to use the services their existing infrastructure is already on. Something similar to what happened with elasticsearch.
Please let me know if you need any help setting it up. We'd love to help in any way we can.