If you are confused about anything
No. The only data stored for urls for checking already existing songs / videos, some metadata and nothing else.
We guarantee the download for YouTube. Certainly other platforms are supported by us through the open source library youtube-dl, but we do not guarantee that they will work. View here to see all sites that you can download from: Supported Sites
Of course it is. You can download songs at any time, according to your wishes without any ads. We hate ads.
Unfortunately, we cannot say exactly how the system works. But we are working on it to make it faster, easier and more user-friendly. The download system is still in its infancy and under development. Visit my main page, to get other software.