None of those are examples of vendor lock-in. Linux, sql, and python all come from many different vendors. If you were using, say, Debian, SQLite, and IronPytho

None of those are examples of vendor lock-in. Linux, sql, and python all come from many different vendors. If you were using, say, Debian, SQLite, and IronPython, and they all exploded, you could switch to alternatives pretty easily, I think.