Except that people who use web apps don't give a shit about the code running the site. They're using a transient app over the network as the service over a stateless mostly-idempotent protocol -- they care only about responses coming out of it, the code that generates the responses is completely irrelevant.
Stallman is incapable of understanding this, perhaps because he simply has never used any such services. Users want to have and control access to their data. That's it. The AGPL's only effect is to underscore how inadequate it is at doing anything for end-users -- by taking Freedom Zero away from operators, it leaves the exploitation of data and network effects as their only means to non-menial profit.
I'm curious why you suddenly started bashing the AGPL in the middle of an unrelated discussion? I believe Reddit is covered under the CAPL which is more like the GPL than the AGPL.
No one forces website operators to use AGPL code. It's a trade they make in order to cut development time in exchange for meeting the openness conditions. It's up to them to decide if that is economically worthwhile.
Banning people from deciding that trade is worthwhile would be fairly counterproductive. And having the courts invalidate the license because you have a philosophical problem with it seems to be slightly unfair on the people who wrote the code and chose to give it away for free (with some conditions attached). You might as well say it's OK to steal library books because, hey, you don't believe in the contract that says you have to return the books is fair.