Data centre GPUs tend not to have video outputs, and have power (and active cooling!) requirements in the “several kW” range. You might be able to snag one for work, if you work at a university or at somewhere that does a lot of 3D rendering - I’m thinking someone like Pixar. They are not the most convenient or useful things for a home build.

When the bubble bursts, they will mostly be used for creating a small mountain of e-waste, since the infrastructure to even switch them on costs more than the value they could ever bring.