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Making advertising very specific, small, essential and not obtrusive, for example restricting ads on each products only to businesses offering services related to that product, I mean not a similar product but that exact one. Imagine searching for a software or library that does X, then on the product/project page there's a small area showing someone/some company offering services (install, customization, maintenance, etc) for the very same product: one per line, no unnecessary graphics or animation, just plain old links, complete with verified customers feedback. I'm sure, albeit not perfect, this would reassure many potential users, including companies, concerned abut the bus factor or other similar problems that sometime discourage the use of Open Source software.