Thanks for sharing this OP. Anyways, all I can see in just-dice is the tab Invest. And it's investing with the casino, not staking. Is it the same on the site?
You are right,it's investing, but the staking made by the site is shared between the investors. It has a risk, if someone wins big on the casino you could lose part of your investment. The site is holding half of the network, so isn't easy to lose in the long run.
But if you don't want to take this risk, then you can install your own clam node and start by yourself with zero risk. For that, you need a PC connected 24/7 and some skills to configure the staking. But should be possible for all.
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Warning: I see this as an attempt to find buyers for a dead altcoin.
I just see this as an opportunity to multiply the coins by holding, i'm not even sharing affiliate links, I'm just sharing knowledge. as i say in the first post, if someone has a better way i would love to read it.