Seems that you don't know what are hosted channels and what is Dunder... Dunder is just an implementation of standard LN LSP inbound channels for Blixt. Hosted channels are something totally different !

Dunder is like what is offering Zeus with the LSPS1 protocol https://lsps1.olympusln.com/ but adapted to Blixt wallet. Eventually Blixt will adopt the LSPS1 as a standard protocol.

I explain it here in this guide: https://darthcoin.substack.com/p/dunder-lsp-and-lightning-box-provider