You need to make up your mind about the licensing.

README.md says:

The code in this repository is licensed under a personal, non-production source-available license. Visit https://etcha.dev/pricing/ for additional licensing options.

LICENSE.md says:

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions ...