That's... ridiculous. That guy is trolling or intentionally spreading disinformation. Sudo is free software; it can't have a "backdoor" without being well-known, and such a "backdoor" would have been fixed years ago.

Sudo is a useful tool on multiple-user machines. It allows you to choose exactly what special privileges everyone gets, so you can let them do some special things without giving them permission to screw everything up. It's not particularly useful on single-user machines like PCs, but it doesn't hurt on those machines either.

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