1. Digital images are not scarce but a unique hash quantifiably is by the laws of mathematics and cryptography.

2. 1 sat = 1 sat, broadly speaking, but sats aren't necessarily fungible on-chain - for example if you had a load of BTC from Silk Road the Feds would be following you through the chain.

3. Whether ownership of an NFT can hold up in a court of law largely depends on the intellectual property rights that come with it. If you owned one of those apes, you'd also own the IP, which is enforceable in a court of law. If the creator retains ownership of the IP, the answer would be no.