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A former Gizmodo writer changed his name to ‘Slackbot’ and stayed undetected for months
(www.theverge.com)
This is a most excellent place for technology news and articles.
Not necessarily to justify Gizmodo in this instance, but Slack does paywall their SSO feature behind their Business+ Plan, which seems to currently run $12.50/mo/user, which is about a 70% increase from their next pricing tier. See: https://slack.com/pricing
Given the price difference I wouldn't be surprised if they didn't want to pay for that.
Edit: someone later in the thread linked this page which helps explain why this is generally a bad practice https://sso.tax/
Wild ride scrolling through the percentage markups and thinking you found the peak at Cloudflare only to see Coursera looming over it