eCash makes sense if no user accounts are needed/available or just accounting is very hard to do. But user accounts with the usage history and an email address usually have the advantage for apps to reach out for upselling for instance. Do you already have a feeling which industries or even concrete use cases would benefit from going accountless?
That is correct, ecash only makes sense if there is no need for identity.
IMO, this is a whole new (old) way of doing things. It is shifting the data balance back to the users. I think of this as a solution for companies and customers that want to opt out of the data collection business model and just go back to the "I sell this, you pay for this" model.
I think this can be used in any industry, it just depends on what the providers and consumers value.
Me personally, i dislike everything that requires a signup/email just for the purpose of advertising/selling me more stuff, and i would hope other customers feel the same way and force the market in that way.
But maybe it's just me, in which case this will remain niche
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