Teslas market cap is 1030m on 31.5m of revenue. GM is 79m on revenue of 122.5m. That's 50x the market cap per revenue.
If having too big of a market cap relative to revenue is wrong, then you're basically saying that companies should not invest too much in their future, just use their money to sell as much as possible right now.
You know who else has extremely high ratios of mktcap/revenue? Pharmaceutical companies trying to cure diseases that have no available cure. Is it wrong to try to cure those diseases?
Unless you think it's higher quality or in a different area... but the whole world is going toward electric cars and autonomous driving. Tesla AutoPilot comes in a distant second to GM according to Consumer Reports: https://www.cnbc.com/2020/10/28/gms-super-cruise-tops-teslas...
Tesla build quality also ranks low, even according to Elon: https://www.cnn.com/2021/02/03/business/elon-musk-tesla-qual...
It's kind of the reason Toyota has a monopoly on hybrids: they have a patent on the best kind of hybrid system. Ford held a similar enough patent that Toyota entered into a license agreement with them.
Getting a 20 year monopoly on key EV/battery tech will be worth an unimaginable sum.
I don't agree with Telsa's valuation, but I can appreciate why investors support them at their current price.
They will always be quite disjoint when viewed with an single/small number of revenue data points.
Also what if it had been in place during the dotcom boom and bust?
There's a reason CEO's at this level take $1 in salary.