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I think this is an interesting concept for gambling: https://pooltogether.com

Ah, a lottery on a blockchain. Why not!

Except, unlike a national lottery, you can't trust the issuer and the value of your prize fluctuates even after you win.

I was referring to the concept, not whether it is centralized or decentralized. Most blockchain applications don't need one to function.

1. Blockchains actually allow for "provably-fair" (cryptographically determined) lotteries. A lot more fair and trasparent than national ones.

2. This specific lottery uses stablecoins, with a value tied to the US dollar.

So both of your points are invalid here.