At the risk of being shouted down, I thought I'd point out that "tithing" means giving 10 percent of your income to a church. It comes from the Old English word teogotha meaning tenth. I've seen nothing that establishes tithing in the Watchtower.
While I'm all in favor of pointing out the Watchtower's lies, hypocrisies and faults, the language we use matters. If you claim they've established tithing and they've done nothing of the sort, you instantly lose credibility.