Yes. And there’s also the issue that even if someone would choose to work for free, incremental bodies in an org tend to increase the org’s complexity.
When you start you don't need to handle millions of customers worldwide. If all you need is to handle a million customers per month digitalocean can handle that on a single server and you wouldn't hire a single let alone many developers to manage that.
If you ever reach the point where you need to handle 100s of millions of customers a month / hiring someone can save you money but perhaps serverless makes sense.
99% of businesses will not reach that level.
The amount you'll pay for a single additional developer, even if it's "just" 70K, is already close (if not double) your whole Clould costs when you start...