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If you would have bothered to see the linked presentation you would know that GNU Taler is explicitly positioning itself as a better international payment standard to prevent central bank digital currencies from taking that role (as commercial banks do not like the idea either).
Its pointless to compare GNU Taler to Bitcoin or other crypto currencies, as it solves a completely different problem space.
Again please see the above presentation. And yes a central bank could also use Taler, as one of many banks, which would prevent it from being centralised on a single one like in the case of CBDC.
GNU Taler isn’t a currency, its a payment system. And it can be used internationally, you are just completely misunderstanding its purpose and how it functions.