I have not played any blockchain games, I just read some things about them. So can someone please clarify for me...

Don't blockchain games still use centralized servers to run the actual game code itself?

So, just like with DLC where they can void the content you purchased, can they not also alter the game code on the "Block Chain" games to reject, nullify, or alter the actual effect of your NFT in game?

For example, can't they alter the game code in Decentraland to say "if property token says 'WhiteHouse' then refer to a dog house on 3rd Street in the game display" ?

If this is the case then the game would actually still be a centralized game and the NFTs would easily be no more valuable than toilet paper if the game servers shut down one day.

For a game to truly be a blockchain game and decentralized then the game source code itself (not just the game data) would have to be stored on the blockchain, open source, and unalterable so that such centralized actions cannot occur and anyone can host it.

So is it already decentralized servers?

Or is just the NFT game data decentralized with centralized game servers that can, on a whim, block NFTs from being used just like DLC content?