Some of the biggest companies with the most social impact were started to solve problems everyone (sometimes even the founders) thought were trivial first world

Some of the biggest companies with the most social impact were started to solve problems everyone (sometimes even the founders) thought were trivial first world problems. Microsoft was started to write software for the Altair. Apple was started to make personal computers when personal computers were considered less useful and marketable than calculators. Google was started to make a minor improvement to search technology. IBM was founded to tabulate census data. Sony started as a radio repair shop. Oracle was started out of a failed CIA contracting gig. My point being, it's hard to tell beforehand what a "worthwhile" startup is. Often the founders end up solving a problem they didn't know they were working on. Sometimes, even when they solve a problem they thought was trivial and only interesting to themselves, they open up vast new frontiers of human knowledge through sheer serendipity.