It took only ten years for Bitcoin to have a significant impact on the world.
Bitcoin has been having significant impact since it was created in 2009, but only those that hold it knew this at the time.
If Bitcoin is regarded as a kind of currency, it will affect the original legal currency of the country.
How? Even most people still convert Bitcoin to fiat for daily spendings, and when using p2p, people also interchange fiat and Bitcoin, I do not see how this is a problem. People that are core Bitcoin users still do not have options than to make use of fiat for so many reasons. So, how will fiat be affected when people are still making use of it for daily purposes?
However, if Bitcoin is used as an investment commodity, it is bound to face a problem— -tax.
Yes, but most people are using exchanges and custodial means to buy cryptocurrencies, this should not be a problem. Also there are many fiat based businesses evading taxes.
I would like to ask how other countries currently tax Bitcoin.
Most countries are not yet taxing Bitcoin and crypto investment in general for now, but there would be amendment in the future. I think taxing cryptocurrencies investment in US has been effective. The taxing is just like normal taxation, but the taxing can differ from one country to another.
In China, we transfer cryptocurrency to others through Binance, and at the same time receive transfers from other people's bank cards.
Do not forget Binance can track your capital gain, they can comply with the law of a country, and people to report their capital gain and pay their tax.
If Bitcoin's hash address is one-to-one correspondence with the person, then Bitcoin loses its anonymity.
You are right, anything custodial makes Bitcoin not to be pseudonymous. Bitcoin is not anonymous but pseudonymous.
Taxation and anonymity seem to be opposed.
Yes. But people do not care about the pseudonymity, that is why trading volume on decentralized exchanges are not much compared to centralized exchanges. Even most people that are using decentralized exchanges first bought cryptocurrencies from centralized services.