I belive smart people want to work on ideas that are net positive and as you know many ideas (even successfull ones) are net negative.
* Airbnb - locals are outbidded by tourists
* uber/lyft - better solution is public transportation
* Amazon - big marketplace but no idea whats fake and have to pray to god that no one dies while trying to deliver our orer
* Roundup - kills grass and also friendly insects on top of that gives you cancer
* Teflon - no need to burn calarioes on washing dishes but pollutes ground water with forever chemicals
* meat industry - you get tasty meal but animals and earth suffer
* Zillion sataliets in orbit - remote locations (no one lives or not need) gets access to internet but astronomy suffers
the list goes on