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The database in question was 80mb, which is very small. It’s also fast and backups are as simple as copying the file.

Not advocating for this particular use case, but we’ve all seen more egregious abuses of SQLite.

Git is designed for text files. An 80 MB text file is huge. An 80 MB binary database is tiny.

I depends what you are putting into it... I think it's completely feasible to get 100000 customer records into 80 MB... and then some

Git is a tool to diff code. Github host git repositories.

You are using Github to store data, not code.