My hot take is that the Slack logo is an Alphabet-product logo. The colors aren't quite right, but it's red/yellow/green/blue like an Alphabet logo. It would fit right into the lineup. It's particularly similar to the (obsolete) Google Podcasts and Google Photos logos.
My pet theory (that I don't sincerely believe) is that this was deliberate to help smooth a hypothetical acquisition by Alphabet, before they were bought by Salesforce.
> My pet theory (that I don't sincerely believe)...
To be clear, this combination is a tetradic palete on a color wheel. Color theory and simplified logo trends make this coincidence much more likely than it would initially appear. Still funny.
