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There is no commercial entity behind YOURLS, just coders spending their free time on their computers.
Donations definitely warm the heart, they are a nice way to say "thank you" for something that is developed and released for free.
If you want to say "thanks", and any amount of money says "thanks", use the following link: http://yourls.org/donate
Money collected will help keeping the infrastructure and domain name online. Thanks a bunch to those who did donate and those who will!