鯖缶

自由ソフトウェアではなくなっていたらしい。

From today the license applied to the project will be the Apache 2.0 license with an extra line forbidding usage of the codebase as an integration or app to Atlassian's Confluence or Jira products.

License Change from standard Apache 2.0 license · jgraph/drawio · Discussion #4623

10. None of the Work may be used in any form as part, or whole, of an integration, plugin or app that integrates with Atlassian's Confluence or Jira products.

https://github.com/jgraph/drawio/blob/acd938b1e42cff3be3b629e6239cdec9a9baddcc/LICENSE#L176-L178

やりたいことはわかるが……