In my country (Australia) ALL gambling winnings and profits are 100% tax free.
You don't have to declare it because it is considered a hobby.
In the USA and other countries gambling winnings are treated the same as income and gambling companies are required by law to withhold federal income taxes.
If I had to pay taxes I would quit gambling. The risk wouldn't be worth it.
Does your country tax gambling winnings and if so do you declare it yourself or does the gambling operator withhold the taxes on your behalf?
What you wish for is not going to be possible because we have different individuals thinking differently in the corridor of power in different countries, this is why the tax laws and other laws are not the same. You have a point too, but your points do not particularly have to be that way. In every good environment, I do not see the reason why we should not pay tax on all our incomes, we often do not know the benefits of this, but if you are in a good country where the system is working, please, appreciate it and find all means to support the government and the fellow citizens, especially in the area of taxed.
I said that because I am in a country where the system is not working, we envy you guys. On our part, any reason for us not to even pay the tax will be so welcomed as our government can't account for anything but corruption.
Now, in a country where the government is not asking for a gambling tax, indirectly, you might still be paying it. This is because they tax the casinos/sportsbooks very much, and your losses are included, and since most people are losing, the government is not losing. Either they tax you or they tax the casino/sportsbook, they still have the money. But it is fair to only tax an individual with their gross profits, and not on the immediate ones. This means that if you had lost $100+$100+$100 initially and now gained $400 later, you should be taxed from the excess $100.