My situation may be a little unique. My husband is American, I'm not. We live in a Middle Eastern country and are planning to fly out to my husband's hometown to host a reception (depending on the how the virus situation is). I wouldn't consider it a destination wedding since his all of family and friends and some of mine already live on that hemisphere of the world. The only ones doing any traveling will be us. But of course, that's just my opinion.
My knowledge of American weddings comes from movies (which we all know is very unrealistic) and my husband isn't the greatest at the topic either.
After doing some extensive Googling, I've learned that it's considered rude to ask for money as a gift. In my culture, it's a social norm to give money (whether you're a guest or family member) but also very acceptable to put in a note at the very bottom of invitation something along the lines of "accepting envelopes only" or "no boxed gifts".We don't have a registry because we already have everything needed to build our lives together and the idea of flying back with multiple bags of expensive presents doesn't seem to be the most convenient. This is why I ask if it would be rude to ask for cash.