Not anymore. A peer-to-peer network was used to avoid the massive network egress costs, while the creator worked on a cost-efficient hosted app.

https://twitter.com/nickwalton00/status/1203843111287316485

https://www.patreon.com/posts/update-32193930

Check the follow on messages to that they've gone peer to peer and it's no longer costing money to host.

https://twitter.com/nickwalton00/status/1204064712394076160

Not anymore.