What's in it for the hoster? if there hosting you for free? Absolutey nothing. Despite any "plans" they have, advertisments will not keep a service running. And now that invested capital is running dry most free services on the net will simply just disappear. It's not like I can go to McDonalds and get a free burger in exchange for advertisments on the wrapper. That would be a terrible decision on McDonalds part. Same thing will soon apply to online services.