GitHub emails are becoming almost indistinguishable from LinkedInpic.twitter.com/YzjEXdnA9I
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
To send an email to all your users, just define a new type of communication that everyone receives by default ("Exciting New Product News 2.0"), add a new preference for opting out of it, then send everyone email. It's free real estate! There are no consequences!
GDPR violation?
Totes. Can only use data for the concrete goal the data was initially provided for. Changes require opting back in.
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