No advice has a 100% success rate. The existence of failure cases doesn't inherently make the advice bad. The advice to pursue your passion as a startup idea is

No advice has a 100% success rate. The existence of failure cases doesn't inherently make the advice bad. The advice to pursue your passion as a startup idea is still relatively good advice. It's the best way to avoid the most trite and cliché ideas. I don't know what someone passionate about spreadsheets would create, but it would be more unexpected than building a generic AI writing app. Whether it succeeds or fails.