Let me first start this off by saying what an amazing job you've done thus far with this project.

However, I'd love to see you implement encrypted file uploads ( via the Up1 service ) for users who dislike Imgur.

A reference to their source implementation can be found here: https://github.com/Upload/Up1

Previously, ShareX ( Windows based utility similar to this ) had also implemented support for this and was a widely used feature till their developer decided to remove support for it.

The general security features offered by an Up1 hosting site is irrefutable to Linux power users. Currently there are tons of Up1 instances floating around the web but most of them generally stay up for long or are run by unknown individuals, as such I've looked into a reputable source and would recommend you, by default, use the service at Riseup.net as they've had a long record of being privacy activists.

For additional information, their site details are:

Upload URL: https://share.riseup.net/up
Data File Path: https://share.riseup.net/i/< id >
API Key: 59Mnk5nY6eCn4bi9GvfOXhMH54E7Bh6EMJXtyJfs

Best Wishes,
leogx9r.