I found two apps that seem to be violating the AGPL license. They both use the AGPL-licensed lemmy-js-client library, which means the apps themselves should also use the same license (which is the whole purpose of Copyleft). But they aren't. I don't know if Lemmy developers and contributors are aware of this.

The apps:

https://github.com/ando818/lemmy-ui-svelte - Apache license

https://github.com/aeharding/wefwef - MIT license

What should we do about this as a community? I informed one of the app's developers about this and it doesn't seem like they care. I wonder if some of the proprietary apps that are being developed right now also rely on this library.

Update: wefwef now includes the AGPL license in the repo. Thank you to the Lemmy user who reported it to the author and to the author for quickly resolving the issue :)