I've always felt guilty by taking for granted the rare breed of virtuous humans that provide free excellent software without relying on advertising. Let's change that and pay, how much would I “lose” anyway?
If taxes are a concern then I think opencollective.com is the recommended platform:
“Open Collective is a legal and financial toolbox for grassroots groups. It’s a fundraising + legal status + money management platform for your community. What do you want to do?”