Equifax is a consumer product with uninformed customers, wherein the 'blowback' can't really be had by individual customers, rather, it has to pick up as a media storm.
Slack contains a world of sensitive corporate information.
Oddly though I don't recall any major email company losing gazillions of emails to a hacker either, but I could be wrong.
It's an existential risk for Slack, but not unlike most other SaaS companies as well, so it's just part of the cost of doing business a per the industry.
