You should simply forbid this kind of scams, not make their own section, and on top of that calling it "Investor-based games" ...
That section is a sort of "trashcan" for all the ponzi schemes discussion, don't worry because it is presente the warning :
Warning: You are in the Gambling section. You are likely to eventually lose any money that you gamble/"invest". Additionally, moderators do not remove likely scams. You must use your own brain: caveat emptor. Do not gamble more than you can afford to lose.
I think this is sufficient, if someone want to lose their money it is free to do that ( now all know what is a ponzi scheme).
This.
It is a corner of the gambling section now. If noobs go looking in that section and still ignore all the warnings, there is not much more that can be done. Scams/games are not moderated here.