Based on what I read from some reports that Elon had taken the username @X from his original user without giving any monetary compensation but he thanked him and offered him a choice of X Merchandise and a tour of X headquarters. Handle @X's initial user was Gene X Hwang who was a one of the founders of event photo company Oange Photography, now the handle has changed to @x12345678998765.1 But in this case we as Twitter users do not have any rights in the ownership of the handle name we use. so that Twitter can take the handle that we use at any time.
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Reference:
1. https://www.msn.com/id-id/berita/other/cerita-pemilik-asli-akun-x-diambil-elon-musk-tiba-tiba-tanpa-imbalan-uang/ar-AA1esv0F?ocid=winp1taskbar&cvid=b98be1dddfb34416833aae68a1f0184e&ei=10
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Reference:
1. https://www.msn.com/id-id/berita/other/cerita-pemilik-asli-akun-x-diambil-elon-musk-tiba-tiba-tanpa-imbalan-uang/ar-AA1esv0F?ocid=winp1taskbar&cvid=b98be1dddfb34416833aae68a1f0184e&ei=10
So I was right. I have been seeing tweets regarding this but I was not sure if it was true. However, you made a good point here about users not actually owning their usernames and can be taken away by the platform whenever they want. If it is true that Elon offered those things to the recent username owner then I think it was pretty generous of him and based on the previous owner's tweet it seems like he expected it to happen the moment X was announced.
