Stories like this make you wonder if some companies pivot too quickly.
After all, sometimes ideas don't fail because of the idea, they fail because of execution or sales or marketing. In which case moving on to a new idea is not going to yield any better results. People should stick with their current idea while learning all the other stuff they need to know to succeed and stop blaming the idea.
"Don't look for the next opportunity. The one you have in hand is the opportunity." -Paul Arden
I don't think it's easier. It's just that when you're stuck on your current idea, creating a new idea _seems_ easier - but it's a false economy.
> apply it to insert hot market here
I don't chase what other people are doing, that's for the samwer brothers ;) (although let's not forget they have multi-millions so they are probably successful by their own defenition)