You don't just have to self-host, they offer a hosted version that's far more reasonably priced than Figma[1].
Their free tier supports up to 8 members, limited to 10GB of storage.
The next tier supports unlimited members, and is price-capped at $175 a month, but is limited to 25GB of storage.
The final tier is price-capped at $950 a month, with unlimited storage.
> unlimited storage
Surely it's not actually unlimited. I wish such claims wouldn't be as common in the industry.
For now. Mattermost too used to be cheaper than Slack, and Gitlab too used to be cheaper than GitHub. I know the story, "look we did X, the open-source Y" and two years in you now have two versions, the free and the "enterprise" one with exclusive features.