1. Supply and demand are the determining factors of value. I understand that this is like collecting an antique coin with a long history. As long as someone has a great desire to collect the coin, the value of the acquisition represents the value of the coin. But why is it that now, when cryptocurrency has gradually been widely known by many people and applied to life, there are still so many people who are resisted? Is this an intolerance or resistance to new things?
There are many reasons why Bitcoin is not in every home. For example, many countries have very strict regulations regarding cryptocurrencies, in many it is even completely prohibited. Not everyone has to be interested in it, it is even recommended for those who do not understand some basics of Bitcoin, and blockchain not to enter it until they learn at least the basics.
By the way, every person in the world knows about gold and that it has value, but again, the vast majority do not keep their assets in gold. And that has little to do with any resistance.
2. The essence of the exchange should be to store part of the user's funds in an independent wallet of the exchange, for example, 1% of the user's funds are fully stored in an independent wallet, and each user is configured with a receiving address to distinguish different accounts. Is this so? If so, how does the exchange ensure the security of funds in independent wallets?
I would not comment much on how exchanges store coins, as far as I know, they have hot and cold wallets. Again, as I said earlier, exchanges are not intended for storing coins, but for trading. This is my final answer to all your doubts, if you are thinking about a wallet where you will hold assets, no exchange is good enough for that.
Not to mention a hack as a potential risk, almost every exchange has faced it at least once, look at the case of FTX exchange, which went bankrupt and of course left with all the funds of its users.
3. Yes, my access rights were lost. I bought nearly 900 bitcoins in the early days, but the mnemonic of the wallet could not be retrieved for login. Secondly, for these bitcoins with lost access rights, will they never be accessible?
Sorry to hear that. I suggest you present the whole problem here, do you have any wallet file or something, I am sure you will get the best advice, and maybe you will get lucky with access to coins.
Without access to the wallet (whether you or someone else), your 900
BTC will be there forever.