Far-right users of X (formerly Twitter) are singling out individual Activision Blizzard employees for comments made in support of DEI and inclusion at the company.
I’m honestly surprised that Slack doesn’t have some kind of steganographic watermarking so that leaked screenshots can be traced back to the original user, given how many big companies use it for all their internal comms.
I did use slack; we had general channels with tons of people and smaller channels/meeting rooms with 5-30 people. If it was a 5-30 channel they can be found.
The techniques you're thinking of are for documents sent by email or some such. You add innocuous whitespace or typos that are unique to each one, and send them individually. If one leaks, you can match it to the employee who received it. That doesn't work for screenshots of Slack.
Well you could make it work, for example some random pattern in chat backgrounds that trace back to whoever is the user. That would still show up in a screenshot.