I agree with Chuq Von Rospach. Sites shouldn’t be forced to take advertising, even to give that money to a charity.
I don’t take advertising here, well, except if you count my Amazon link and my occassional mentioning of Seagate, which sponsors my video show.
Anyway, there’s a cost to advertising in clutter, in extra bits that the infrastructure needs to push out, and in reduced quality of experiences for users.
And, it’s a smart piece of business on the part of Craig’s List to try to be different. You get audiences that way. There’s other ways to make money from audiences than just putting a few ads on your site.
I’m very loyal to Craig’s List, cause he got me my job at NEC, which led to getting a job at Microsoft.