Why do compiled binaries still require libdb, BerkeleyDB, and others?

I compiled Bitcoin Core on one Raspberry Pi from source after installing all the necessary dependencies including all the libboost’s and BerkeleyDB. That application runs fine, and bitcoind lives happily in /usr/local/bin

So I tried copying bitcoind and the other Bitcoin executables from that directory to a brand new Raspberry Pi running a brand new clean operating system, and the applications wouldn’t run. I got errors until I installed libboost and BerkeleyDB and all the other dependencies on that second computer as well.

I thought the compiling process made a stand-alone executable program? Why did the compiled binary still require these shared libraries?

Like, executables are available to download from bitcoin.org that are truly stand-alone. How can I compile from source an executable as stand-alone as these?

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