Sure you can hack together a small Google clone using Elasticsearch in a weekend. Can you index all the worlds information and serve the worlds search needs with your little MVP? 99.99% chance no, even if you were given a few hundred engineers to scale it.
Even if you could do it technically, where are you coming up with the money to do so? That's not seed-round or even series A round money to do that. That's series D, hundred+ million dollar swipes of a VC's credit card just to get off the ground. Microsoft threw billions at it with Bing and still never became more than an also-ran. The only place that seems to have a real chance is DuckDuckGo, and I'd be very interested to see how their story has played out up to this point.
Google benefited greatly from growing as the web was growing. Trying to index the world's information in 2020 is an astronomical task compared to indexing the world's information in 98, 99 era.