Do they expect people to pay taxes on trades they lost money on?
You won't be expected to pay money on losses, but you will be expected to document and declare them. Doing so is actually beneficial for you; you can use your capital losses to offset your capital gains, meaning you pay less tax overall. If your capital losses are greater than your capital gains within a tax year, you can even use this to offset taxes you pay on gains from other sources (such as stocks), or even on your income tax. There is a cap on this at $3,000 per year, but you can roll any excess over to the next financial year as many times as you like.
For example, lets say in one year you made $2,000 from bitcoin, but at the same time, you lost $3,000 from altcoins. You would have a net loss of $1,000. You would owe no tax on your cryptocurrency activities, and you would be able to offset $1,000 in tax from elsewhere. If you had also gained $5,000 from stocks in that year, you would only have to pay tax on $4,000.
How much tax do people pay after purchasing BNB that they use in trading?
How much tax do people pay from a transaction fee from sending crypto out of Coinbase?
How much tax do people pay when they convert the small remainders of coins at Binance into BNB?
How much tax do people pay for lost coin?
How much tax do people pay from washed coin?
How much tax do people pay from gifted coins?
How much tax do people pay from Coinbase Earn income?
When people buy coin at Coinbase they do not charge taxes it is just a transaction fee so how much are people expected to pay?
Why do none of the exchanges mention anything about taxes at the moments when all the transactions are being executed?
Is it the users fault for not understanding all the tax laws?
There are still too many unknown variables to take the IRS seriously about this. I think it is premature to start paying taxes on crypto. I think we are all looking at at least 3 years before ordinary people and ordinary traders are going to be expected to pay taxes for this stuff. Most people in the world still have no clue what is happening in the crypto world and that includes most governments are still completely puzzled about how this can adapt as a working asset class.
There are still people that are moguls of money in our society who think Bitcoin is invalid and they still think it was created out of thin air. You can't expect USA citizens to pay taxes on it since the president of the USA claims Bitcoin is essentially fake and bogus and not a valid form of money. The biggest investor Warren Buffett publicly bashes Bitcoin (although I suspect Buffett is already fully loaded up on Bitcoin and if not he plans to be). Bill Gates has slammed it too.
Once those 3 guys get on board then you can start thinking about taxing people but until then the wealthiest and most powerful people say it is just a ponzi scheme. Why follow the tax laws when the government does not yet consider it truly and genuinely taxable? The IRS is claiming that Bitcoin is "property" but they still think it is fake money. The IRS has prematurely launched these new tax rules and they know it.