It's an arbitrary amount, and we are happy to process any withdrawal. One thing we are still trying to figure out, is how to get people spending the free sats in the network to help get things going... vs just signing up, doing a couple easy things and then withdrawing sats. But then, if you deposit SATS, you should be able to freely withdraw them. Work to do...
Yeah, it's a good question, we have a similar problem with Donate4.Fun. May be you should require more tasks to be done - like post a question, answer something, etc.
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