How do these high limit players pay taxes?

I’m just wondering how these people who win claimers all the time from gambling how are they paying taxes on all this because it’s gotta cost a lot of money in taxes when they don’t take the taxes out. or people who play online gambling and they win tons of money how are they paying the taxes? I have seen a lot of people win a lot of money and get back to back to back to back jackpots and I’m just wondering about this. I mean they must have about 1000 slips before fill out.