What else would you call DuckDuckGo? Easy is relative. It is relatively easy to build a search engine that can service a user's requests (possibly less useful absolutely, but within the realm of service) compared to building an electric grid and power plant that can handle a large number of user's power needs. One of these can be done with technical skill to get to an MVP in a weekend. The other requires a hundreds of millions of dollars worth of equipment, legal fees, permits, and engineering time before you even get started digging.