Who has posted a scam bitcoin giveaway?

Could you please elaborate on the recent reports of a suspected Bitcoin giveaway scam? I've seen several posts online claiming to offer free bitcoins in exchange for some form of participation, but I'm wary of their authenticity. Who is responsible for these posts? Are they coming from well-known and trusted individuals or organizations in the crypto community, or are they from unknown sources? What are the common signs that indicate a bitcoin giveaway is a scam? How can one identify and avoid falling for such scams? I'm particularly interested in understanding the motives behind these scams and how they can be stopped.