It has nothing to do with Bitcoin... it's a bearer credential to a server.
Can that server hold custodial bitcoin? Sure, but the server still sees the Bitcoin flows in and out.
It doesn't add privacy to Bitcoin, it's effectively adding privacy to Json-Web-Tokens.
Take note of who's misrepresenting it and who funds them.
The appropriate use of ECash will be much less exciting, like setting up private chats on paid nostr relays.
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