With a confident attitude, you cannot fail.

自信一点，你一定会成功的。

youdao

If you have people like that in your life, you cannot fail.

如果你在生命中遇到那样的人，你不会失败。

youdao

Keep to the West, where the sun sets, and you cannot fail to find her.

你们直向西走，在日落的地方，不会找不到她。

youdao

When it sits in port, you cannot fail to notice it.

BBC: Costa Concordia disaster: Evacuating a cruise ship

If you cannot connect with people you will fail.

BBC: Gordon Brown says leadership challenge was 'silliness'

If you can acknowledge reasonable usage in these contexts, I fail to understand how you cannot extend the same to internet culture.

FORBES: Enders Game, Orson Scott Card, and People who Hide Behind Pen Names