Programming as a Marketing Weapon
blog.optimizationrobot.com
blog.optimizationrobot.com
I get what you're saying but I think you're taking this in a different way than it was intended. These tools are all something that hopefully helps somebody out (for instance I get emails and tweets about how useful people find ForAGoodStrftime all the time), and as such are a wildly different alternative to me buying a bunch of Google/Facebook/Banner ads.
This isn't about tricking anyone or any scummy advertising, it is much more: "If you found this tool useful, I'd appreciate it if would checkout this other project I've been working on."