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Nuclear waste literally comes from power plants. If their residual heat could be used to generate electrical power, it would be done already.

It can be (and is, although not everywhere) used, for cogeneration - residual heat from any thermal plant used for district heating/industrial heating processes.

Nuclear waste also comes from plutonium production. And it could be used to generate power, but this leads to fuel reprocessing, which runs afoul of nonproliferation treaties, as it produces weapons-grade fissile material.

I think the idea is more that the waste heat pouring off the CPUs (crypto processing units ;-) ) could be used to help heat up a living space

Also it's contributions to global warming?

I did read about a more general idea where excess power plant capacity would be funneled into asic crypto mining. I think this makes a lot of sense if you are thinking about power sources that take a long time to ramp up. For these plants, I imagine it could be necessary to quickly bleed power to reduce capacity in order to balance the grid.