Because my goal is to move everything to self hosting whenever possible. Also there is nothing stopping anyone else from using it.
I want to host my personal instance. But doing so doesn't make any sense since if I'm alone using it. So I'm better off using Google directly, unless someone can search whatever he wants via a service I'm hosting :/
So as with many things it is swings and roundabouts and is determined on what you want to do. I wouldn't call the model flawed, it just seems that the benefits of it aren't what you want. Which is fine.
The whole point of searx is not to mix your google research with other people google research, hence making it harder to track you?
AFAIK being alone in using a searx instance is useless, as google will still track you via this searx instance.