We do not store any photos in any servers, only for processing, and even for that we can't access them. They are not used in any way to do anything other than creating the cartoons. Not used as further improvement or datasets as well.
So your gallery on Voila is visible to you only, nobody else can see it.
We understand users' concern about data privacy and it's why we take extra measures to take this very seriously.
If you still want to remove access to your gallery photos, you can do that from your device's settings.