Z:gnu-www-ja-who-does-that-server-really-serve--aaf187-SaaSS and proprietary software/en

SaaSS and proprietary software lead to similar harmful results, but the mechanisms are different. With proprietary software, the mechanism is that you have and use a copy which is difficult and/or illegal to change. With SaaSS, the mechanism is that you don't have the copy that's doing your computing.