“These servers wrest control from the users even more inexorably than proprietary software. With proprietary software, users typically get an executable file but not the source code. That makes it hard to study the code that is running, so it's hard to determine what the program really does, and hard to change it.

With SaaSS, the users do not have even the executable file that does their computing: it is on someone else's server, where the users can't see or touch it. Thus it is impossible for them to ascertain what it really does, and impossible to change it.

Furthermore, SaaSS automatically leads to consequences equivalent to the malicious features of certain proprietary software.” RMS