Even within English, a lot of the terms we use are kind of unnatural. I had an American professor once who complained about the use of the term "default" in computing. "Default" is what the bank does when it runs out of money. What does that have to do with me choosing something in the computer?
Similarly, a "file" is a bundle of papers, not an individual document. A "program" lists things that will happen in a performance, but it's not an instruction sheet. An "application" is a form that you fill in for a bureaucrat. Etc.
Default makes sense to me... according to your own definition. It's the choice when you're out of choices. You fail to fulfill your obligation to specify behavior, so, default behavior.
"Default" means someone being unable to do the thing they're supposed to do. If your opponents don't turn up to a darts match, they have defaulted, and so you win "by default".
You can just about support the computer sense by thinking that a default choice is used when a user has failed in their duty to make an explicit choice, etc. But it is a bit of a stretch.
Of course, by now, the computer sense has fed back into broader usage, so it just seems like a perfectly ordinary use of the word.
Similarly, a "file" is a bundle of papers, not an individual document. A "program" lists things that will happen in a performance, but it's not an instruction sheet. An "application" is a form that you fill in for a bureaucrat. Etc.