My coworker wrote a bot for Slack that spams most of our channels with random gifs throughout the day. Most of my other coworkers find it amusing, but to me, it's quite distracting. I opened an issue with Slack to ask them to add an "ignore" feature, but they responded that ignoring anyone is counterproductive so they won't be adding it. Thanks, Slack.
I am surprised that sort of behaviour is even allowed. The places I've worked would've probably given such an employee a very strong reprimand. Then again, they've also had clear policies about not... slacking off with the company's resources.
That said, there are a few thirdparty clients; you might like the text-only ones: https://news.ycombinator.com/item?id=20500880