Meaning of the word "in vain the net is spread in the sight of any bird" in English

What does "in vain the net is spread in the sight of any bird" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

in vain the net is spread in the sight of any bird

US /ɪn veɪn ðə nɛt ɪz sprɛd ɪn ðə saɪt ʌv ˈɛni bɜrd/
UK /ɪn veɪn ðə nɛt ɪz sprɛd ɪn ðə saɪt ɒv ˈɛni bɜːd/
"in vain the net is spread in the sight of any bird" picture

Idiom

it is useless to try to trap or deceive someone who is already aware of the danger or the trick

Example:
He tried to trick me with a fake contract, but in vain the net is spread in the sight of any bird; I had already read the fine print.
The scammers targeted the tech-savvy generation, forgetting that in vain the net is spread in the sight of any bird.