Sorry to say this, but your friend sounds stupid, backward and ignorant.

Quote from: Mcphail on Today at 10:02:15 AM

Today, a friend who works in the traditional Internet field announced his opinion after knowing that I bought Bitcoin and some altcoins:

1. He thinks this is a casino. Only those who open the casino and the lucky ones can make money. Don't indulge in gambling and don't be blinded by the deviation of survivors;

Can he say the same about trading stocks, forex, commodities etc?

I mean, the whole world of money is about some people winning and other people losing.

Quote from: Mcphail on Today at 10:02:15 AM

2. He believes that the fault tolerance of the blockchain is too poor and the efficiency is too low;

And yet he didn't suggest any better options.

Quote from: Mcphail on Today at 10:02:15 AM

3. He pointed out that the public chain cannot be upgraded, otherwise the consensus will be torn and various forks;

Let's talk Bitcoin. Is he trying to say Bitcoin network has never undergone any upgrade since its inception?
Your friend's Ignorance is off the charts.

Quote from: Mcphail on Today at 10:02:15 AM

4. He believes that giants represented by Facebook can apply blockchain in the financial field, but this has nothing to do with ordinary people's speculation, and it has nothing to do with the public chain;

Tell him to try to look up Libra coin. A Facebook side "blockchain" project that failed before it even started,

Quote from: Mcphail on Today at 10:02:15 AM

5. He believes that Bitcoin is essentially a religion, so it's okay to be bullish, but it's nonsense to talk about blockchain killer applications.

What a lame kind of analogy he has. According to him. I guess fiat currencies and Gold are also small religions.

Quote from: Mcphail on Today at 10:02:15 AM

Time will prove everything.

Right The other thing getting "halved" every 4 years are the critics and nonbelievers.