Honestly!! This thread is so full of joyless and judgmental people.
Why on earth do you care how people you love or at least are close enough to, to be invited, approach their wedding gift list?
Getting married is a celebration of love and declaring of an intention to be together forever. The creation of a new family. It should be a joyous celebration.
Either get a gift or don’t. Don’t worry about other people.
Don’t get married so you can get stuff - it would be cheaper to go shopping!
And if someone is kind enough to invite you to their special day, then try to be happy for them, not petty and nitpicking.
if you don’t like them, then you can by all means graciously decline your invitation.
Oh and also, have a word with yourself!!