In the case of the Saas app, I think there is usually more to it that can't easily be replicated. For example, while Google email service is very Simialar to wh

In the case of the Saas app, I think there is usually more to it that can't easily be replicated. For example, while Google email service is very Simialar to what was previously out there, they offer things like large space, reliable (don't laugh) service, trusted branding etc. Other providers offer quick development of new feature which a copied service can't easily replicate. This is the key, replicability (that's not a word ;p ) or lack of is your protection. In the end, you can't sit and wait. Even if they don't copy your app, others will offer similar products ( I think this is fair and square) and you will die if you don't continue to provide more to the user. Ubuntu One is a open source version of dropbox. I don't think dropbox will die because of it. Dropbox hosts the service and offers good support and feature development. Ubuntu's offering might not be as good. Even if it is, Competition is everywhere.