Why should that be illegal?
It’s multiplying the productivity of our economy, instead of someone having to waste time and money making the apartment actually look like that, you can just generate an image of it, that’s massive productivity boost with no harm done to the final product, unless the tenant cares about the slippage between a generated image of an apartment that looks nice and an apartment that’s actually nice.
And plus thats time the real estate agent could have spent prompting claude to cure cancer so its a double win