100% scam. You have the audacity. Nakakahiya ka!
You boldly, brazenly and shamelessly advertise yourself as someone people should entrust with $250,000,000. You have mental issues. See a psychiatrist.
You live in some kind of parallel universe where these big transactions don't happen. Some people have to send them, and when they do, someone will have to escrow them. Or would you rather they tried converting all those coins to fiat before making the transaction?
Who knows, this could be the biggest scam of a lifetime, but there are no actual "warningsigns".