Your comparison to Tuft and Needle is not very good. Everybody hates mattress stores for their sleazy business practices; it's a given.
There's no unanimous hatred for Slack, however, so your ads come off as pretty ignorant. We use slack at my company and have 0 problems with it. I am perfectly aware of its limitations and I am fine with them.
Also, I have to download a desktop client to use Ryver? 2004 called and wants their software back.