Your query doesn't really make sense if you think about it. What is Gold back by? I know some will say Fiat, and what is Fiat backed by? are you going to say Gold? All of them are not supposed to be backed by anything but as we all know, it is because the general consensus of Bitcoin right now is that, it has not been fully accepted or trusted by all which is the thing with Gold and Fiat because the Government made it so. So, Gold and Fiat are only backed by trust or acceptance by the people and nothing more which has not been extended to Bitcoin yet.

There is no absolute value. It depends entirely on your psychology and your needs. If you don’t think Bitcoin itself has value or is not worth owning, or you should choose the one you know better and needs more in your heart.

Yes bitcoin is not backed by any assets till dates either by gold or anything but yet it still has value even far more than the so called assets we all know. And this is achieved by it's acceptance by the community. The community gave it more value than coal, gold, Mercury etc.

thats why people never trust in bitcoin, no real stuff back bitcoin up. people still ask about what you can do if you dont have any physical thing you hold. the fact, people get what they expect and bitcoin repeat what people want to see.
investation not from other people, you must ask your self, convincing your courage, to invest in bitcoin.

Yes, bitcoin is not supported by anyone. It would be very difficult to answer this question. Simply put, the value of bitcoin will continue to exist if it is still used by the community, if it is not used again directly its value will be lost. The logic goes like this, If you invest in bitcoin it means you are a supporter of bitcoin to keep its value. This means that the value of bitcoin depends on the person who uses it, and there applies the law of the market, namely "supply and demand".

People invest in anything that has value. Bitcoin is now  the digital crude oil that is being explored by crypto investors because it is more reliable, profitable and secure than any other investment. If you have the means of investing in Bitcoin do so now I bet you won't regret it.

It has value largely because a lot of people think it has value. Like other commodities, currencies and tradable stuff, if people are willing to pay for it, then it has value. If people are willing to accept it as payment, then it can be used to transfer value. If people are willing to buy and keep it, then it can be used as a store of value.

Of course bitcoin has a real value. How can we use it and become our investment if it has no real value? Just a common sense. Even it is just a digital coin , it has a value the same with tangible asset and fiat currency.

for rich people I don't think it's a problem to invest in bitcoin even though it's high risk, but rich people certainly have money reserves, or free money that is worth developing. therefore for rich people who know the potential of crypto, then they do not hesitate to invest

This issue is as old as hills. I used to think that Bitcoin is just a toy or a Ponzi scheme. But now I am getting crypto and economic education at the university, and I have completely changed my opinion. First of all, I want to ask you if Gold is backed by anything, or why do many people think that it is one of the best investment? What is more, as Bitcoin is adopted by many companies and even whole countries, it become supported by their ecnomics.