I tried to copy & paste but it wouldn't work, there's a section on Taxrelief4escorts which explains that even if it's illegal it's still taxable.
Examples given are ;
Shop selling fireworks to underage child, profit from that sale is still taxable.
Business buying and selling stolen goods, profit from this illegal activity is still taxable.
People running brothels are often sent tax bills after being raided, and after the police have seized all assets.