To me the argument here is because it's easy. Even if the interaction layer is centralized the underlying tech is decentralized so everything can easily be validated and that's the key difference.
I think he touched on that in the article. The masses are trusting the centralized API, not the blockchain. His NFT exists in the chain, but not the API, so it effectively doesn't exist in the eyes of the market.
That feels like an argument that could be applied to web2 too though, and it falls apart there too: It’s never been easier to spin up some servers and whip up a basic social media site or search engine or online store, but it’d still be hard to displace Facebook, Google or Amazon. The problem isn’t with the ease of starting a competitor, it’s the psychological and social forces that cause people to prefer having one default place where they can go for a certain thing.
But as noted in the article, that's not the case. OpenSea stores data that then isn't on any blockchain, like royalties. That's done as just a regular web2 feature, a database on OpenSea's backend.
So no, it can't be validated, and it can't be migrated.
Royalties is a funny example because a) they’re being standardized, see eips.ethereum.org/EIPS/eip-2981 and b) royalties are entirely opt-in. You can happily transfer NFTs without having to pay royalties if you forgo an exchange that respects them.
That’s literally one of the most salient points of TFA: protocols move dog slow and provide too little too late, platforms iterate fast and give people what they want right now.
But there will be other features over time, that would not be standardized. As per article centralized platforms progress faster than decentralized standardization. Switching cost will grow.
