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Why do you think Slack got built as it is today, and nobody built a similarly popular chat application bundled in every Linux package manager?

Isn't that what IRC sort of is? There's a lot of overlap of the functionality, but I guess not enough?

The perpetual complaint is that IRC isn't GUI, can't upload PowerPoint files, etc. Basically that it's not webscale.

Slack and IRC have functionality overlap like a Volkswagen Beetle an an Abrams Tank.