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"Not engaging with unsolicited messages is a helpful avoidance technique that is easy to implement"

Goldberg said he got an unsolicited invitation on the Signal messaging platform on 11 March by an account named Michael Waltz, and was then added to the group chat about Yemen two days later.

“This is an attractive opportunity for many folks and I’ve already received a ton of unsolicited calls with interest.”

People should also be alert to scams, from unsolicited messages relating to the issue, in the run-up to the deadline.

But the unsolicited bid might not be a failure - at least as far as Musk is concerned, experts say.