Without the preset lists of filters, this extension is nothing. So if ever you really do want to contribute something, think about the people working hard to maintain the filter lists you are using, which were made available to use by all for free.
You can contribute by helping translate uBlock Origin on Crowdin: https://crowdin.net/project/ublock
It's why we want to be good users of open source and contribute back, whether that's donating or helping write documentation, manage issues, etc.
The cost of open source is the direct cost - what it takes to build an adblocker in this case. The cost of a for-profit product is the direct cost and the profit margin - a higher number in every situation. Instead of the for profit company paying that, it's some external party and if that isn't you it's.. well, still somebody. As the saying goes, if you aren't the customer, you're the product.