This is simply a result of using a product for something it wasn't meant for (i.e. a hack.. or else something like https://github.com/rauchg/slackin wouldn't be necessary). Very 'clickbaity'.
Agreed, but people are creative making slack as their community group where people are already used to Slack. For growth hackers planning to cold email these members can be spammy and it has already been happening in some groups but in a smaller scale.
Private teams are okay because your teammates are not going to do anything evil towards you. This is more of a focus on the open community slack groups, like SSG and iOS Developer groups that contain 5000+ community members. Most of these groups are just open invitation that allows people to just sneak in, take thousands of emails and pce.
Just a guess, but they probably care more about selling to companies and other organizations where team members seeing your email address isn't a problem.
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[ 2.9 ms ] story [ 17.1 ms ] threadIt would be like being upset that people can see your contact info when you join webex or some other online conferencing app.