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How is manipulating clipboard not a problem? What if something replaces your fingerprint or bitcoin address?

An app being able to declare some operations to perform on the clipboard (overwrite, append, etc) that don't return any information about the contents are not a problem from a privacy or security perspective. At most they can be annoying.

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.

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