I don't check this in every open source project around there, but I think most of the bigger ones already have a lot of sponsors and support from big companies.Babel is backed by a lot of big players in the software industry already. Others projects are made by big companies like React or VSCode, where money is not a problem.
Anyway, I think if you want to donate to open source projects you should donate on your own, not increase the price of your product to do that, it doesn't look good if you state that way.
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