How crypto gambling is taxed in The USA?

[LeGaulois]

Quiz:

A) The winnings from casinos/sports betting are considered, and so taxed, as an income.
Correct?

B) Gambling winnings are concerned for
  1. the federal income tax
  2. the state income tax
  3. both (if both, does it mean double tax?)

C) To my understanding, some states disallow gambling, and some others allow only sports betting
Correct?

D) If you live in a state in which gambling is forbidden. So no federal tax, since you're illegal. Is there a state tax, or you're fully tax-free (but still illegal)

thanks.