I think that doesn't work for most smaller projects. That'll work for something like Firefox, but there's little reason for random, unheard of tools to have an image on the web. Plus the naming of some projects is super generic, which can make it hard to find correct images.

Some software changes appearance often, too, and google is bad at knowing what up to date is. It can be really easy to find wildly out of date images as the top results.