When the investors are Microsoft, Google, Meta and Amazon. Then they have some deep pockets

Not if more investors keep throwing more money at it. It only stops when investors are no longer willing to fund continued expenses and they are unable to fund it themselves. At which point if they are spending a lot more than they are earning which appears to be the case currently, they would have to increase income and/or decrease expenses. So expect more and more push to become profitable as investor money becomes harder to find.