I used to be on a project that, IMHO, had possibly considerable impact on capabilities and even some specific financials in a publicly traded corporation.

After about third earnings call (which happened a tiny bit before the trading window for our stock grants opened), I (re)learned the hard lesson that even if we delivered and I had actual, material, move the needle impact on corporate financials, that would not translate in any way to stock price. Except maybe if I pushed it really, really, down by causing an avalanche of problems that resulted in some big name deal going down.

The stock prices are vibe based, once its publicly traded your share value will be based on whatever vibes pushed numbers in excel around earnings call, and it's perfectly normal occurrence to beat expected earnings per share for 3 quarters straight and every quarter get a different vibed-off reason as to why the price should go down.

No you don’t. If you did, you would be subject to lock outs. The average rank and file employee at any BigTech company knows only a minuscule more than the general public.

Amazon for instance has over 1 million employees. You know nothing about most of your coworkers or whether other teams are delivering featured

You have more information, but only in a small area. if there is fraud by the executives they will hide it from you. If a different division doing poorly bringing everyone down you won't know before anyone on the street. even in your own division you won't know all the important numbers, a great feature coming doesn't mean customes really want it, you might be sucked into thinking a useless vanity project is something customers care about.