I believe there's more profit-oriented piracy of SaaS based businesses than traditional software. It's rare that someone will take an app, crack it, and start selling it under their own brand. People clone apps but in general they've remade the code entirely by looking at the software and coding their own version.

Conversely however, I do hear about companies that have taken someone's SaaS app by dumping the front-end code, and building their own backend, and releasing it with absolutely no changes to the elements they've stolen.

This may be due to my filter bubble making it so I hear more about web apps (I write web based apps) but anecdotally it does seem that SaaS is not a protection against piracy.