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Taint analysis is a real thing that several papers have been published about, but the implementations aren’t in a state where they could be run in real time without massively hampering performance. Also they’re mostly focused on findings bugs in native applications rather than privacy on the web.
As a person who has been managing Linux servers for about a decade now, trust me that a few hours or days of learning docker now will save you weeks if not months in the future. Docker makes managing servers and dealing with updates trivial and predictable. Setting everything up in docker compose makes it easy to recover if something fails, it’s it’s self documenting because you can quickly see exactly how your applications are configured and running.