Building a DAO with Exsisting operating systems

Hello ,
Hi, we are building a DAO and are looking into using an established Operating system S like Alchemy.

We wanted to know which smart contract blockchain to build it on. Do Cardano or Polkadot have any established Operating systems like the ones built with ETH.

Or could anyone point me in that direction.?

The project below is the subject of the DAO

Nervemeter Magazine

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