On the CV side: no. Gambling is heavy statistical analysis, a lot of regulatory-compliance work, and no small amount of human behavior work. It's a challenging space that any competent future employer will recognize as a place where you wear a lot of hats and learn a lot of transferrable practical skills in those three mentioned spaces. Nobody who would be willing to hire a former Boeing, Raytheon, Facebook, Google, Pornhub, Microsoft, Apple, Nvidia, SpaceX, Tesla, Baidu, Amazon, Alibaba, Morgan Stanley, or Palantir employee is going to bat an eye on you having Fanduel or whatever on your résumé.
They care about the skills you can bring to them today, not how you got them.
On the moral side: that's the one you're going to have to decide for yourself. As other commenters have said: other people can tell you their morals, and you can collect facts about the industry, but it's your compass that'll tell you whether you can sleep okay at night working in that industry.
My father spent most of his career doing systems work for a major tobacco company. He was able to make enough money doing it to support his family extremely well. It does, sometimes, keep him up at night whether securing the future of his children was worth indirectly contributing to the premature unmaking of so many other families.
Life has not handed him an answer to that question. How much you care about your own system of ethics, how much personal integrity you choose to maintain, and how many compromises you're willing to make to trade one negative for another positive is up to you.
(It is perhaps also worth noting that no answer is set in stone. Google was seen as a savior-factory about a decade ago. I have relatives who will tell me about the Bad Old Days of computing before Microsoft reigned in the chaos by clear-cutting the massively-incompatible diversity of choice in favor of an ecosystem that worked with itself. And IBM's rise and fall from grace are industry legend. This isn't a question you ask yourself once; it's a question you'll keep asking yourself your whole career.)