[elliotwu]

Elegant-cli's author's mistake was not including a full-text copy of your MIT license (which has your name) in the repository (his own MIT license does not count as a "proxy"). That is precisely what the MIT license requires, and hence a direct non-compliance by Elegant-cli.

However, the MIT license does not dictate how Outstatic should be mentioned in Elegant-cli's marketing materials (like their website or README file).

Though poor etiquette, it is permissible for Elegant-cli to not mention you or Outstatic anywhere else, so long as full-text license copy with your name is included in the repository.

If you needed that kind of attribution, you should have picked something like the BSD-4-Clause (https://spdx.org/licenses/BSD-4-Clause) or MIT-advertising (https://spdx.org/licenses/MIT-advertising.html) licenses, instead of the MIT license.