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/

Ars and Reddit are under the same parent company, conde nast or however that’s all structured. I also have noticed ars seems to write very frequently about Reddit, even if it is usually in a critical light.

I get mixed feelings about articles like this one.

Legally, you cannot refuse. DMCA is written such that the host must take down first and ask questions later.