Well yes, there might be. They're not an allowed operator in Lithuania... Apparently so isn't
Unibet, one of the best known bookmakers all around the world. Probably because gambling is highly regulated in Lithuania and only bookmakers or casino's with a Lithuanian license are allowed to operate in their jurisdiction.
A real life example for me: Bet365 and Casumo aren't allowed in Belgium because they don't have a Belgian license, you can't even sign up to them. Unibet has obtained a license and you can legally sign up to them as a Belgian citizen.
Does that make Bet365 and Casumo illegal as a whole? Ofcourse not, they have UKGC and MGC licenses and are allowed to operate in markets that accept those.