That is why, white-label online casino is an extremely popular option. By just buying the license of a product and acknowledge that as your own in a legit way, you can start your business in no time. It saves your time, it saves your money.
With WagerGun for instance, you can launch your fully-operating crypto-casino in only 24 hours. It offers a lot of flexibility too, as both of the front and back-end are fully customizable.
AFAIK there was a user in here who've also tried to sell a gambling website in which they can modify all of its content easily, but it was deleted due tothe user being suspicious and were a probable scam..
https://ninjastic.space/topic/5276357Therefore, I don't think modification websites especially on gambling are that useful nor effective enough to be a good one. Not to hate nor to bash your business, but better look at those successful gambling websites out there and those that failed. Many exclusive projects that hired real web developers are much successful than those that have used modified websites. Why? It is because modified websites tend to have either annual or monthly payment to run. Yes you can have license, but you're just renting it.