I seriously doubt many AOL users have such a dependence on AOL access it would threaten their livlihood and survival to leave. Nor do I think there would be a long period of searching and rejection trying to get accepted by another ISP.
The ugly truth is, most AOL users became AOL users because AOL made it easier than anyone else. The vast majority of AOL users stay with AOL voluntarily, because the service suits their needs well enough. Some like the proprietary content, too. Some with other ISPs desire that proprietary content enough to pay $14 / month (recently raised) to access it without an AOL account.
A few, however, get in tiffs and show their psychological dependency on mother AOL by putting up bitter anti-AOL Web sites, just like an overly dependent spouse or lover when their partner gets tired of it and moves on.
If AOL doesn't suit you, don't use it. I don't. Many I know do.
And, incidentally, free speach is not an issue. The Constitution applies to government repression of free speach. "Censorship" is a "service" of AOL many appreciate. If you don't, they have no obligation to you. Use a different ISP.