The most common problem with a startup idea? Too many other companies doing something very similar.

It is difficult to win at scale if there are many people hitting the same problem.

If you are doing something different:
- is it enough for you to win?
- is it just a nice to have?
- is the reason your 'different' hasn't been done that the others saw a flaw in it?

You can win in a highly competitive market but the bar is that much higher.