This really does seem like a violation. We develop enterprise help desk software and also offer it via Download.com and didn't receive a notification of this change.
It doesn't exactly look great on our software that a toolbar is installed alongside it -- especially for a professional business product.
Maybe you can answer this question. Why would any developer use download.com instead of just self-hosting on something like S3? I've always found "download sites" to be nothing but trouble and do everything I can to avoid them.
When I see someone's official site being at a place like that, it feels kind of like your office would be in your mom's basement and your business cards were chosen from a template at Kinko's.
S3 is really expensive bandwidth if you expect to serve up tens of thousands of downloads of any considerable size. Take the average game demo which these days is measured in hundreds of megabytes to gigabytes. If 1000 download that kind of file per day it starts adding up.
More importantly, how do you market your software? Many people go to download sites to browse what's available, so being listed is a form of advertising. If you don't expect a hefty bandwidth bill by offering it directly on your site, why not do both?
Sites like Download.com and Sourceforge.net will get you many more users, as these sites have a much broader user base. You can always decide to host the software yourself, and have a download functionality, however, you would be responsible to drive traffic yourself. Marketing a site can take a lot of effort, energy and maybe even money.
It doesn't exactly look great on our software that a toolbar is installed alongside it -- especially for a professional business product.