If I wanted to donate a few dollars a month to the future development of a phone OS that will allow users to continue "sideloading". What is your recommendation, and why?

Will LineageOS, Graphene and /e/OS be affected by Google's changes to prevent sideloading? Is UbuntuTouch or Sailfish OS promising in the long term?

I understand that right now we are in a bad place, but in your opinion, what OS do you think people who care about freedom should rally around?