There are no moats to being a plumber, a baker, a restaurant...
The moat concept is predominant because the idea that everything must make billions have infected the debate about businesses.
It's all about being a unicorn, a giant, a monopoly, making every body at the top billionaires, and it's like there is no other way to live.
Except that's not how most people do live, even entrepreneurs.
Even Apple, which today is the typical example of a business with a moat, didn't start with "we can't get into this computer business, we'd have no moat".
They have a moat now, but it's a consequence of all the business decisions and the thing they built after many decades.
They didn't start their project by the moat. The started their project by providing value and marketing it.