To sum it up, Bitcoin lending is a good way to make more Bitcoins from what you already have. And please notice this disclaimer: only lend through sites that you trust. Such sites will comply with the usual requirements that you expect from non-Bitcoin related sites as well. That means they have proper terms and conditions in place, they disclose their status of incorporation and contact details. Some sites in the Bitcoin world do not do this and in the end people wonder what happened to their Bitcoins. Therefore, when you earn Bitcoins from Bitcoin lending watch who you deal with and only use Bitcoins which you can afford to lose.
The Bank for International Settlements summarized several criticisms of bitcoin in Chapter V of their 2018 annual report. The criticisms include the lack of stability in bitcoin's price, the high energy consumption, high and variable transactions costs, the poor security and fraud at cryptocurrency exchanges, vulnerability to debasement (from forking), and the influence of miners.[185][186][187]
Although blockchain can save users money on transaction fees, the technology is far from free. The “proof of work” system that bitcoin uses to validate transactions, for example, consumes vast amounts of computational power. In the real world, the power from the millions of computers on the bitcoin network is close to what Denmark consumes annually. All of that energy costs money and according to a recent study from research company Elite Fixtures, the cost of mining a single bitcoin varies drastically by location, from just $531 to a staggering $26,170. Based on average utility costs in the United States, that figure is closer to $4,758. Despite the costs of mining bitcoin, users continue to drive up their electricity bills in order to validate transactions on the blockchain. That’s because when miners add a block to the bitcoin blockchain, they are rewarded with enough bitcoin to make their time and energy worthwhile. When it comes to blockchains that do not use cryptocurrency, however, miners will need to be paid or otherwise incentivized to validate transactions.
Up to this day, Bitcoin uninterruptedly works as money one person pays another person for goods and services. Once Bitcoin is exchanged, the record of the transaction is publicly recorded onto a ledger known as the blockchain, which other Bitcoin users, known as miners, verify by putting those transactions into a block and adding it to the blockchain after Proof of Work (PoW).

You first said it wasn’t copied but then you said it’s duplicated to millions of computers. Whats the difference between copying and duplicating? Your description of creating a word doc then emailing it to someone and waiting for the updated version from them is from 1999….google docs let’s you work on live docs – problem solved. Question…if an honest entry mistake happens on the blockchain why would you want that recorded on millions of computers forever?

To lower the costs, bitcoin miners have set up in places like Iceland where geothermal energy is cheap and cooling Arctic air is free.[201] Bitcoin miners are known to use hydroelectric power in Tibet, Quebec, Washington (state), and Austria to reduce electricity costs.[200][202][203][204] Miners are attracted to suppliers such as Hydro Quebec that have energy surpluses.[205] According to a University of Cambridge study, much of bitcoin mining is done in China, where electricity is subsidized by the government.[206][207]
On 3 January 2009, the bitcoin network was created when Nakamoto mined the first block of the chain, known as the genesis block.[19][20] Embedded in the coinbase of this block was the following text: "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks."[10] This note has been interpreted as both a timestamp and a comment on the instability caused by fractional-reserve banking.[21]:18
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