Sorry if it isn't clear. Self-hosting is 100% free and without any limitation.

As for the cloud version, I replied here: https://news.ycombinator.com/item?id=37808121

TLDR is that the cloud version hasn't been our primary focus yet and we put a high pricing on purpose that is not the final pricing, while we figure out the good pricing strategy. As of today everything is free without any limitation, we don't enforce any limit. And when we rollout the real pricing, it will be more compelling