Yes, we are aware of the custodial risks associated with ecash. However, the transaction fees on the Lightning Network are high, comparable to those charged by Phoenix. Additionally, completing a payment on the Lightning Network involves multiple steps. The privacy offered by LN also does not match that of ecash. Therefore, we choose ecash as our form of postage.
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I mean that the transaction fees for self-hosted Lightning Network transfers are much more expensive than ecash. 

Yes, I agree. LN isn't free of critics, but still, it is a network functioning successfully since a couple of years and some improvements are coming. Moreover cheap LN payments are well integrated in Nostr as well. On the other hand the ecash protocols, while very promising and having other trade-offs, are still in an early stage.