For independent writers and publishers of short stories, I believe Kindle Unlimited is a feasible platform on which to release your work. And let me immediately say I'm talking about single short stories.
For those who don't know, Kindle Unlimited is an Amazon program which monthly subscribers can read as much as they want as long as the stories and books are in the program.
It's no secret that short story singles are a hard sell when full-length works are in and around the same price. However, with KU, the playing field seems evened up a bit. Readers may feel less threatened, monetarily, when they've already paid their monthly KU subscription and come across a short story that sounds inviting.
And from a writing and publishing standpoint, an entertaining short story is a great way to spread the word about a writer's storytelling ability and maybe influence readers to seek out the writer's other works.
If you're writing short stories, make sure they are the best stories you can write, get them proofread by someone in the writing and publishing business, and try publishing on Kindle Unlimited. It's worth a shot.