Envelope calculation: 1 brain worth of neurons would make 10 million instances available for hire, and at 500 USD per instance would give monthly recurring revenue (MRR) at 5 billion USD.

Not too bad for a startup!

Honestly I see "rent your brain compute for money" as a real thing in the future.

I live that life now. It's a bit demeaning at times, but it beats physical hard labour.

No, it is way less. Consider we have about 10'000 neurons per organoid while our brain has about 100 billion.