god beware if your open source project needs a single private repository to share passwords between admins for example or private config for your webserver. Suddenly you see yourself at 394$ compared to the 7$ you paid before.
Passwords emphatically do not belong in git.
Your private repos should be maintained such that accessing them would not compromise your security.
Let me brig another example for OSS projects that could need a private repository: branches for security fixes that are not public yet.
A private git server would probably be better for that, but also wouldn't cost $0.
Please tell me you're kidding.
Is ansible vault encryption brute force proof? I have no idea. I could spend an hour and figure out. But why not just follow decent engineering principles and double lock my door?