OSS Resistance is about not asking for time to do something yourself while removal of unsigned casks is about what they host in the official Homebrew/cask repo. You're free to make & use your own tap to use with Homebrew without asking, so there's not really anything to square between the two stances - any conflict all comes purely from your 3rd stance about signing in general.

I just threw them a small donation for supporting this software for so long, even if it's only 98% how I'd want the project to be run all these years myself.