It would be like valuing gold as a bond and determining the value is 0. The value is higher than that because the value isn't in a coupon.
Also, ironically, I suspect a zero-coupon bond would probably be worth something because it is likely that some central bank would happily overpay for it in a crisis.
What's claimed not to exist is a Zero Coupon Perpetual Bond. A bond that never matures and pays no interest.
Of course then the article claims crypto is this type of bond. It's a mathy financial jargon gimmick argument.
A modern printed dollar note perhaps does this. The perpetual part requires the government to not cancel the note, which occurred in India and Europe in past couple decades.
https://www.reuters.com/article/germany-auction/update-2-ger...
(Someone is arguing that there are cryptos that do pay coupons, which invites my favourite question: who's taking the other side of that trade?)
If cryptocurrencies were marketed as bonds, it would be reasonable to point out that they do not pay interest or return principal. But no one thinks cryptocurrencies are bonds, just like no one thinks cryptocurrencies are potatoes.
Pointing out that cryptocurrencies completely fail at being potatoes due to their lack of starch has about the same value as this article.
If you take the only two defining features of a concept and remove them both then you're left with something meaningless.
Cryptocurrency, on the other hand, is at least potentially valuable, if people find a way to use it to do real things. Which they have: for example, it is used extensively for remittances in countries with unreliable financial systems.