https://www.beeminder.com/faq#qcoi
But maybe the best way to refute that is that we've been around 5.5 years and our long-term churn (not counting short-term churn of dabblers which is embarrassingly high cuz Beeminder is super nerdy and intimidating-looking!) is only 2%/month.
PS: Huge thanks to enoch_r for the beautiful testimonial!
I realize your feedback is about the impression it gives, totally separate from how greedy we actually are, but we're still tiny ($22k/mo revenue with 3.5 FTEs). And like enoch_r and mgiannopoulos have averred, paying the penalties to Beeminder generally feels super fair. So that's why we've limited the charity option to the ultra-VIP plan. (We're super open to more feedback about this though. We tend to get a highly biased sample of opinion from our users, i.e., the people who weren't immediately put off by our apparent greed. :))