[p0ckets]

I don't think there was a way to hide this from Twitter once it was executed, since each hacked account got a password reset email. Assuming that you can't hide it from Twitter, then it's a fine strategy to make sure that everyone, especially potential customers of the hacked DMs, knows that you hacked these accounts.

[acdha]

How does that fit with the theory I was responding to that they were stealthy with other accounts? It seems incongruous.

[strombofulous]

Some people are reporting that they got similar emails, even if they didn't tweet anything (example: https://twitter.com/BradyHaran/status/1283685874941808640).

The hackers may have saved the DMs from lots of accounts and only publicly used big accounts which don't have any DMs to publicize the hacks