Most companies are this. If you look into detail at the vast majority of successful companies, there is a single product or service that makes the vast majority

Most companies are this. If you look into detail at the vast majority of successful companies, there is a single product or service that makes the vast majority of their money and it was a combination of hard work, right timing, luck, 6 other things and it's not repeatable. Frank Slootman (CEO of several public companies, now Snowflake) talks about this in his book. He basically says "don't try to build new products, you aren't going to catch lightning in a bottle twice". There are a few great counter examples, (amazon with AWS being the most obvious) but not many.