Scary message confusing users of Moodlecloud sites when registering

During the Learn Moodle MOOC a few people new to Moodle have been signing up for MoodleCloud sites and a couple of them have been confused by a message which comes to their email and which they don't understand. Here is one forum thread about it https://learn.moodle.net/mod/forum/discuss.php?d=39574#p68326 and I will paste below the private message I received on the same subject. Also pinging tsala because I am not sure how to classify this issue (it's not a bug so is it a task or improvement) dobedobedoh I know you were involved in Moodlecloud - do you recall what generates this message so we could perhaps tone it down, explain it and improve its grammar? I guess it appears to come from me because it is coming from Moodle.net?