This is the first WP/WaaS solution I've seen that automates subscriptions and provisioning while scaling horizontally. WP Ultimo is interesting but multisite is not easy to scale vertically past a few hundred sites. A website provider expecting to host more than a few hundred sites is likely to hit a technical wall so it's great to see how WPCloudDeploy can help.

I'd personally not be comfortable managing WaaS provisioning via self-hosted WordPress itself (security and the 24/7/365 concerns) but can imagine there being a number of niche "instant website" providers having some real success with this. All the best to its makers and users. Very ambitious and another great example of how WordPress can be used for literally anything.