A: No. Just because code is on GitHub does not mean it is safe or legal. GitHub hosts many tools that violate terms of service or copyright laws. Furthermore, malicious users can fork a "safe" repository and add malware.
The Zoboko platform addresses this by allowing users to upload documents (such as PDFs, TXT files, and EPUBs) and utilize a dedicated "downloader" functionality to output perfectly rendered files suited exactly for Kindle’s operating system. Key Features of Zoboko Downloader Zoboko.com | Free EPUB Books & PDF Documents Zoboko Downloader