I'd say yes for 3 reasons: 1) BigCo's are usually slow to recognize a good idea is a big enough idea for them to implement until the idea is a big company at w

I'd say yes for 3 reasons: 1) BigCo's are usually slow to recognize a good idea is a big enough idea for them to implement until the idea is a big company at which point you have already won. 2) If BigCo does somehow realize that the big idea is a big enough idea for them to implement early on, they are just as likely to acquire you rather than build it out which isn't the worst situation in the world. 3) If the remote chance that BigCo comes along and crushes you, you have a great story to tell in your next investor presentation or interview. [ADDED] If the idea requires a lot of BigCo's resources or API you have to be more careful. For example, if you need to build a full mapping company to implement a feature google could just turn on that is probably not a good strategy. Likewise, if you need to use a google maps API (if there is one?) you run the risk of them shutting off access to it and implementing themselves.