
The fact that a user is technically able to receive a Direct Message from you (e.g.

You may not send unsolicited Direct Messages in a bulk or automated manner, and should be thoughtful about the frequency with which you contact users via Direct Message.

This is what it says about direct messages:

To protect both users and the platform itself from practices that are aggressive or could compromise the service, Twitter established in late 2017 a policy of specific rules and recommendations for automation. Follow me also on this, this and this other social network Yesterday at 4:51
