I use a private SearxNg instance that is self hosted on my home server.
It draws results from multiple search engines that you can choose from: DDG, Bing, brave, start page, Wikipedia and many more.
It is easily deployed using docker containers. Being self hosted it's pretty quick. Only slowed slightly by making simultaneous queries to multiple search engines.
It isn't about development investment. It's about engines. Engines have long tail after sales profits from maintenance and parts. It's why Toyota recently unveiled their ammonia fueled engine and declared electric vehicles are dead. Electric engines remove a ton of after sales profits in the form of servicing, spare parts and upgrades.