If your clipboard contents were overwritten with an arbitrary wallet address immediately before you paste into an exchange's "Send BTC to..." field, that would

If your clipboard contents were overwritten with an arbitrary wallet address immediately before you paste into an exchange's "Send BTC to..." field, that would be a pretty big problem. I wouldn't expect that most people would double-check to make sure a series of gibberish characters matches what they expect, especially if they don't have any reason to suspect that paste wouldn't output exactly what they copied a moment ago.