the best investment gambling site is moneypot,
much gambling site use service moneypot
another moneypot maybe you can try in crypto-game net or bitves pliko, because much gambler playing in there
I guess it would be safer to at least invest to couple credible casinos out there that accepts investment for us than sticking to one gambling/casino site. This way, we will always have a fallback in any case that one of these casinos go offline or shutdown its operation for any other reasons or through fortuitous event.