Bitz Casino claims to possess a Curacao Master License and that it's owned and operated by Win Sector N.V. If you visit the official website of the alleged owners, there isn't much information there. They don't have a complete list of partner casinos. If you go to the "Projects" tab, you can find two brands: Raj.Bet and Crypto.vegas. Crypto.vegas has been rebranded to Bitz.

Raj.Bet is similar to Bitz in that you can't find license information on their website. Both casinos claim to be owned by Win Sector N.V.
If you try to authenticate the two websites to check if their licenses are valid via https://www.curacao-egaming.com/public-and-players/authenticity, the result is "Unlicensed."

I tried to find some other casinos that are owned by Win Sector N.V. but to no avail. I came across this list (https://www.askgamblers.com/online-casinos/companies/win-sector-n-v) but after a quick check, I found that these brands are owned and operated by other companies and not Win Sector N.V.