And what if you’re not in the US? The author of uBlock is in Quebec (or so says their GitHub profile), and various jurisdictions might have different rules on donations.
For anybody who needs a FAQ about where the donation button is the absolute worst case difficulty for any jurisdiction is calling an accountant to have them do it for you.
If you're getting "big" donations, stripe or paypal will send you a k1 if you make > 20k. Otherwise there are not really any other administrative things to worry about.