Google built a moat around its essential product: searching on the Internet.
Speed of access, an Internet browsing engine , contracts with non-GGL browsers, cloud data centers, maps/locations/navigation, fiber cables/internet pipelines, social networks and personal management software, AI/ML research, personal devices OS ...
Impossible is nothing, but any incumbent will likely take in capital linked to Google. GGL is dominant across the world's hundred and something countries. Excpect places where it is banned(China) or shunned(Russia), anywhere it is equivalent to a monopoly of internet services.
From a technical perspective, a challenger can rise up. From an economic standpoint, a challenger would not last long (maybe locally if favored by regulation). Even the most successfull others: Apple or Amazon would not dare take on Google's Ads or Search Engine. Microsoft tried with Windows Phones and Bing, then ended failing to dominate the market. Google is not singular business. It has so many tentacles in the tech sector that wave a web of interlocking tech products. Growth numbers in Search are boosted by integration in all of Google's own products and the rest of internet users and companies.
To answer your question is to figure out what advantage it has on any competitor starting from zero... Sadly, its network scale is too large to allow an equal challenger.