libcurl often pulls in libz and openssl, so its installs *may* inflate the other two. So I think it's *less* likely (but not impossible) to be #1.
libsqlite I don't have a vibe on. I know it's popular for embedded... 
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OpenSSL has multiple alternatives on POSIX and Win/Mac have OS level crypto APIs. Embedded uses are probably better served by more... minimized, task-specific libraries.
zlib is the go-to IF interop (esp for legacy) is needed, but better algos exist for greenfield.
