That's only true if it happens to be true for a specific scenario. If giving some new employee 100 shares (doubling shares outstanding) actually increases the value of the company by at least 2x by some measure, then the investors holding the original 100 shares should be happy.
Regardless, this is a silly, contrived example. No public company is minting anywhere close to 100% of their total share count every quarter in SBC. It'll be a fraction of a percent, probably? And investors shouldn't care, as long as the company is performing well at metrics that actually matter: acquiring paying customers, where the cost of that acquisition is less than the new customers spend. That, and things like efficiency improvements that cut costs, are the only things that actually matter, because those things are what drive stock prices up.