out of 500 people who download, no more than 10 of them will choose adfly. you'll earn a couple cents, total bullstuff
To put it another way, if every single active user currently playing Blockland went through the ad.fly link, you'd earn, what, $30? That's a pretty poor ROI for a nuisance of that scale.
On the other hand, Ephi, you're the absolute last person that should be talking about monetizing a value-add for Blockland. By your narrow definition, your thread about the RTB hosting service breaks the rules about no advertising.
You created it, it added value to Blockland, and you ask others to pay for it. Why should you be more equal than other content creators?