Finding new markets is extremely hard. meaning if a market exists it's already hosting multiple startups. A market without startups is most likely incapable of giving rise to startups.
In technology sector, often the top startup in a market is worth more than all it's competitors combined and hard to displace; making it a winner-takes-all situation.
When competition for solving a problem is hard, creative and innovative use of socio-politico-economic changes or advancements in technologies is a winning strategy.