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Can you share some details, I can not find anything about it on their github page.
Sure, it’s right on their README: https://github.com/gorhill/uBlock/blob/master/README.md#about
Free. Open-source. For users by users. No donations sought.
If you ever want to contribute something, think about the people working hard to maintain the filter lists you are using, which are available to use by all for free.