i have not found any useful app which does the requested bulk upload functionality on android for imgur.
as alternative, i propose dropbox:
when you copy the image files into a folder below the "dropboxRoot/Photos", you can specifically share the url to the unique subfolder to other persons 8and they will see all files and folders below this dir).
dropbox will generate an html-image-galery which you can browse with the given url. newly added photos on your phone inside the directory will be uploaded automatically when you connect to the internet and be available shortly after to the image gallery. i havent used this on my phone yet, but desktop usage is confirmed to work. dropbox is available from the play store for free (with 5GB space). dropbox uses servers in the US.
example from my dropbox