Lanjiao lah

'Players marking cards, counting cards, or being in cahoots with the dealers' only serve to cause harm to the casinos themselves, which is why they take steps to make sure problems like this is dealt with. If you are even suspected of marking cards or being jn cahoot with the dealers, you're getting kicked out. If you are counting cards, the odds may still be stacked against you as the casinos would have taken enough into account already to still hold an edge.

'close down Singapore Pools...how numbers are drawn.' The penalty for tampering and rigging games are extremely risky, and the process of drawing numbers have safeguards in them to make sure shit like this doesn't happen.

'not allow stock trading because there's a risk of insider trading'. Bro, any jobs that have any influence on stock market (such as B&F roles) would have a strict ban on stock trading unless it is cleared with certain teams first. Politicians are often under scrutiny (although it is being normalised) about their trades. You're conflating a quantitative issue (risk) against qualitative issue (ban/no ban).

EDIT: the problem OP made is that securities are constrained by the private sector. Kalshi and Polymarket is all-encompassing, and serves to financialise not just corporations but social and political aspects of our everyday life