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Historically, letters like this don't bode well for the company writing them. People are drawing comparisons to Apple's "Welcome, IBM. Seriously" ad from 1981. Rdio sent one to Apple when Apple Music was launched too.

Yes! I was racking my head trying to remember where I had heard this before, thanks!

Yeah, this is perfect! Even while there are many tech-savvy people who can’t tell what is this in response to, surely a printed newspaper ad will just help everybody understand.

Wait did they actually put a big print ad in the New York Times? I hope for Slack's sake this is a joke/meme