However, if you don't like the creator of Brave or Ladybird, and you don't believe Google or Mozilla can be trusted to make a browser that respects privacy, giving up is just ceding to those forces.
Like, make a browser. Make it with people who do share your values. That's exactly what Andreas King and the Brave people did. That's what DHH is doing.
If they're right about anything, the "anti-SJW/DEI/Woke/'politics'" groups are right in that you cannot demand creators share your values.
If you like Harry Potter, you have to deal with JK Rowling. There's no way around it. You have to reconcile that with your morals. You don't get to demand that she supports the groups you want her to support in order for you to enjoy her content guilt-free.
So your options are, don't use those browsers, or make your own. You have that ability.
And yes, you, singular you, cannot make all the software. But you can make something and you can find others with your values and eventually you can build a network and that network can build all the software. With values that you can support.
* I know I talk a lot about browsers, but that's just the example. This is applicable to everything.