Of course companies exploit (as in make use of) open source software - it's free (as in beer and speech). As a developer, using open source without proclaiming

Of course companies exploit (as in make use of) open source software - it's free (as in beer and speech). As a developer, using open source without proclaiming that to the rest of your company is hardly plagarism. Unless a licence forces a company / developer to broadcast their usage then that won't happen in the majority of cases.