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I would not sell cycles from my EVs NMC battery.

Hmm, but how often and for how much? If you could get $500 to discharge 50% would that make it worth your while? If you only did it once a month? There are price situations like that on the grid already.

Texas was paying $9/kWh for electricity during their blackouts. If you had 72kWh of electricity in your Tesla that'd be a nice payout...

9 * 72 minus some losses, minus the delivery fees, maybe $600 for what would hopefully be an incredibly rare event.

Meanwhile, after selling all the power in your Tesla in a house that's constantly getting colder with frozen pipes and no electricity you've now sold your best options of leaving with your family for a warming shelter. How many days was the power mostly out?

Personally I'd keep the power in the car in an emergency like that. I'd much rather have the ability to flee if things get worse than sell my best way out in the first few hours of an emergency.

As others have mentioned power companies in California pay a lot for virtual power plants when the demand is high. If power companies can avoid running an expensive peaker plant once a month, everybody wins.

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