I've never given crypto for a wedding gift but I have given it for a Christening gift a couple of years ago. Everyone thought I was mad but I spoke to the parents recently and as it has increased in value ten fold since I gave it, they are over the moon!!

Its also got them interested in crypto! Not sure they have the stomach for volatility though, so may not stay invested until the childs18th birthday! If they do it may pay for a little more than just a crappy car