Bedrock Layout Primitives is an open-source library, maintained by Travis Waith-Mair. Though there are not many costs, there are some costs in maintaining a library like this, namely the costs of hosting the documentation site. In addition to this, the free tier at chromatic is super helpful, but being able to buy a premium tier would give much more confidence to us that future updates and bug fixes don't break how Bedrock Layout renders on multiple browsers.