The problem with these is that bugdoors require you to target way more valuable stuff compared to backdoors. With a backdoor you can target practically any libr

The problem with these is that bugdoors require you to target way more valuable stuff compared to backdoors. With a backdoor you can target practically any library or binary that is being run with root privileges, while with a bugdoor you can only really target code that is directly interacting with a network connection. Direct network facing code is much more likely to have stringent testing and code review for all changes, so as of now it seems a bit easier to target codebases with very little support and maintenance compared to an attack that would target higher value code like OpenSSH or zlib.