The youtube video was showing Elon Musk announcing this "giveaway". It was created using AI, most likely a fragment from one of his presentations and AI generated voice. Whatever you want to call this, the concept of a scam is probably a second oldest after the "oldest profession"
Those videos may have been generated via using A.I tools such as "Dupdup" to convert an image into video with spoken words, and likewise, another paid tool such as "Elevenlaps" which happens be a "Text to speech" Pro tool capable of cloning any voice into been realistic. So it's so sad you never knew about all these til date. Because to be Frankly speaking, ever since these tool got created, so have my doubt on videos or anything digital increased, because you hardly could different what is real and fake today again, and as such, it will be good we all have a strong mindset where we don't jump into believing anything seen on social media easily for safety purposes.
Just a comment, really not interested in debating this while leaking my wounds.
It's so sad you had to learn the hard way, because this is one of the reasons why it's always good to Do Your Own Research (i.e DYOR) before spending a penny investing in whatever, because if only had you asked this question publicly before making your first deposit, you probably could have had one or two people telling you it was a scam, however, it's never too late, as this should serve as a lesson.