/usr is world readable, so no, there will be no problem with other users being able to run the program. /usr/local is where applications that you compile from source code yourself go. Programs installed through the package manager go elsewhere. I have never seen any purpose to /opt, and I believe it is just a carry over from the old AT&T Sys V days back in the '80s.
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Answer by psusi for Where to install software and executables for all users
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