All these hyperscalers do is control the internet and suck money from companies that actually add value via that control. I can name on one hand the amount of successful products GOOGLE has natively launched (without acquisition). This predatory behavior has the opposite effect on the economy you're claiming here.
Is there RoI for this advertising spend or isn't there? If there is, what are we talking about here? If there isn't, then why would people spend on something not giving a positive RoI?