I don't know why, but clipboard libraries tend to be really poorly implemented, especially in scripting languages.
I just checked out clipboardy and all they do is dispatch binaries from the path and hope it's the right one (or if it's even there at all). I think I had a similar experience with Python and Lua scripts. There's an unfunny amount of poorly-written one-off clipboard scripts out there just waiting to be exploited.
I'm only glad that the go-to clipboard library in Rust (arboard) seems solid.