LOL. Those scams generally don't ask for donations. They advertise themselves with something like "Elon Musk decides to giveaway bitcoin in celebration of SN10 landing". Then they'll have some explanation about how the most tech-savvy man wants you to "learn" bitcoin. So, as a proof, you need to send some BTC and Musk will send you double of that.
There generally are lot of supporting replies saying, "OMG, My life has changed. Thank you so much @elon"..
It is indeed funny that people still fall for these scams.
Oh, those are quite prevalent on Twitter then. They're always on Elon Musk's tweets with a photoshopped image. The fault is thus on Twitter for not actively policing the feeds to remove then. It would be incredibly easy to at least tag them with the current OCR they're using on images to detect certain phrases.