Many do - teslas, ford lightnings, Kia ev9, all the GM Ultium stuff (Silverado etc, hummer ev, Cadillacs), and a bunch of others.

Yes, but last I checked the bidi chargers were proprietary - tied to vehicle manufacturer - which is a huge disincentive. I don't want my home's battery connector locked into a vehicle brand/manufacturer.

Lightnings do (well before they were discontinued)

But given they are NMC chemistry, you probably wouldn't want to cycle them a lot for the grid (or just your home).

Many do (assuming bidirectional charger), but it’s only 3.6kW max, in most cases