Are crypto casinos legal in the US?

been seeing a ton of these sites pop up lately and curious where they actually stand legally. like does using crypto instead of dollars put them in some kind of grey area or are they subject to the same gambling laws as regular online casinos?

and does it vary by state or is there a federal stance on it? feels like nobody has a straight answer and every article i find is either vague or trying to get me to sign up somewhere.