Good points from Sharon and Waterlogged.

There is another issue too, as the banners in build logs are not actual banner ads, so they do not get blocked by programs like adblocker. (I don't currently use any of that software so i don't know)

That means that according to Waterlogged's example thread, Gigabyte may not get any exposure due to being blocked, but that list of sponsors will get all the exposure. Granted you do have to look at the build log, but do you really come on forum's like this and never look at build logs?