The answer is that with computerized trading, the value is in the strategy and the code, not necessarily in the processing power. If all Teslas were running the same software to trade, they’d all placing similar trades, which would distort the market and defeat the purpose [...]
Which is why, rather than having the cars trading as individuals, we need to combine the processing power of all the cars into a distributed network that manages a mutual fund jointly for all the owners. You say the value is in the strategy and the code rather than in the processing power, but we really don't want the car trading while it's driving, for safety reasons, but a distributed network could utilize the processing power of all the cars that are idle at any given time. And more power would allow the deeper analysis of more stocks.