In some areas of math the editorial team has defected for precisely the reasons Doctorow states and founded their own journal. The old journal just recruits a new team and keeps on trucking on the strength of its name. Some academics start submitting to the new journal out of agreement with the mission of freeing publishing, but a lot keep submitting to the old journal because they don't care or even know if the public is being fleeced. The end result is two journals.