Craigslist is a business. And a monopoly, like Microsoft in the 90s. Didn't they have the right to decide which browsers are packaged with their OS? Don't they even have the right to decide which browsers run on their OS?
Exactly, they've pretty much run every newspaper classified out of business. Consumers have no choice but to do business with craigslist if they want to list something in a classified.
That's why website owners should focus on creating another classified website that can compete with Craigslist instead of relying on their contents. That's where innovation starts.
And its not about a matter of choice the users have. There are many competitors in this market, and yes Craigslist dominates every one of them because they had an early advantage on the internet. Small sites can't just leech off the contents on their website and slap ads on it to make money.
Lets say Craigslist was a print company that produce and distribute classified as. Will it be right for a small company to steal their content and slap their ads on it and distribute it themselves?
Your argument won't work here, because there are many major newspaper that do 1000x in revenue and distribution than independent newspapers.
Just because they have competitors doesn't make those competitors viable. Apple and Linux still existed when Microsoft was prosecuted by the DOJ.
The vast majority of people searching classified ads are searching craigslist, therefore if you're trying to list something in a classified ad, you're forced to use craigslist.
Sure you could use another service, but Netscape could have also just sold browsers only to Linux customers. It's all about the numbers.
But Microsoft largely escaped the DOJ antitrust case because of competition with Apple. (MS invested in Apple to retain a competitor.)
People aren't really forced to use craigslist. That the vast majority of people choose to search CL isn't good enough. Another company could spend whatever it takes to get people to search their classifieds instead. As long as CL can't or doesn't block that (in contrast to stuff MS was doing that started the DOJ case against them), the competition is viable.