startups are in a bubble only if you think public markets, and FAANG stocks in particular, are in a bubble.
The need for greater funding comes from inflated labour costs. We compete with rising salaries in those public companies. Hiring a proper engineer for less than $200k (and % equity) is a real struggle.
Re
And with illiquid stocks the risk of overfitting is alarming.
re revenues, we haven't even started building the product. But we've gone through the PoC process with some potential S&P 500 customers. That's no reason to celebrate though, and chances are still skewed towards failure. Thanks for the community tip. Real-life connections are indispensable. I'm in touch with various entrepreneurs, but it's uncomfortable to always be on the asking side.
It's probably obvious to say, but shallow learning might work better for trading than deep learning, because of the low signal-to-noise and the moving goalpost inherent in asset pricing problems. Plus, if the main factor is momentum, maybe it's because these models try to forecast changes in the risk premium? But I know far less than you as it sounds, so i'll try to stick to what I know :)