Please consider this feature.

This does need to be a feature.

However you can see downvotes in streams you moderate if you flag the image then check the flag yourself in the approval queue

I see. Thank you for you assistance.

There was a downvote count. Imgflip had a negative impact, so they removed it.

When was its reign?

From Imgflip's beginnings through 2015.
https://web.archive.org/web/20150821043101/https://imgflip.com/
After 2016, they removed the downvote counter.

Thanks