Keysend is good for specific use cases, especially where the receiver have a PUBLIC node. Keysend is not working with a PRIVATE node, at least by default. Is possible only if youi insert in the request route hints, that will point to the last public node (LSP) connected to the private node (see example of how Blixt Wallet is doing it, but is available only between 2 Blixt private nodes). So CLINK could make it easier for podcasters for example, without using a LNURL server, all over nostr.