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>Estonia is a member of the EU, and is therefore bound to use the Euro and only the Euro as its national currency

Just a nitpick, this statement isn't quite true.

>Nine countries (Bulgaria, Croatia, Czech Republic, Denmark, Hungary, Poland, Romania, Sweden, and the United Kingdom) are EU members but do not use the euro. [1]

The term you are looking for is the Eurozone rather than the EU.

[1] https://en.wikipedia.org/wiki/Eurozone#Future_enlargement

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> Denmark and the United Kingdom obtained special opt-outs [...] The other seven countries are obliged to adopt the euro in future, although the EU has so far not tried to enforce any time plan. They should join as soon as they fulfil the convergence criteria

I won't provide a separate source for this statement since it's the same as yours, just a few sentences further down.

For sure. And one notable exception to this is Sweden (sort of). While they are in ERMII - and are obligated to join as soon as they meet the criteria - they are intentionally avoiding meeting the criteria as a means of staying out of the eurozone.

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