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Technology is not the only “moat” there is. A photo sharing app is ultimately CRUD but it’s pretty hard to take down Instagram.

maybe another way of framing it is that not all startups are software businesses, maybe they provide some other service that just happens to depend upon some software, and perhaps a bunch of other things

It's not true.

Think of Dropbox or Instagram or even Amazon

What's there which technologically can't be replicated given enough money?

It's the userbase/network effect which can't be reflected if given

But they all had technical founders/co-founders? Thats what I think OP's question was related to?