Remove commit for good

Question

I know there are thousands of threads for this question.

But I found out something really weird.

If you create a project on GitHub, do some commits.
Let\

Answer 1

According to your additional comments :

You did everything as it should be.
The point is this: git never lose data unless you tell it to (whats known as gc - garbadge collector)

The files will remain there until they will gc will be called.

This is called dangling file

Dangling commit

A commit that isn't linked to any branch or tag either directly or by any of its ascendants.

You can see all the dangling references locally with this:

git fsck --full

The only way to get rid of it is to run gc

//
// !!!Caution:
// It will remove all your dangling files
git gc --aggressive --prune now

Here you can read some more about it.