Tether and other types of stable coins, this is just a virtually digitized ordinary currency and therefore stable coins can not be attributed to the usual decentralized cryptocurrency.
Isn't that an arbitrary definition of "cryptocurrency"?
You remember me of those who talk about cryptocurrency only where anonymity is involved.
No anonymity, no cryptocurrency.
For me cryptocurrency means blockchain-based.
This is the most general definition of cryptocurrency and I think we should stick to that, otherwise everyone will start building his own definition of the word "cryptocurrency", according to the criteria that for him are the most important.
A cryptocurrency is a currency that uses blockchain,
i.e. a currency which benefits of all features offered by this technology, in particular:
1. Greater transparency
2. Enhanced security
3. Improved traceability
4. Increased efficiency and speed
5. Reduced costs
You can distinguish cryptocurrencies according to many criteria.
Being decentralised or not, in my view is only one of them.