The public key thing (pre meshcore) was so big with some of the people you'd be least interested in ever engaging with again. I swear they would brag about being so cool because other people didn't even know how to use it when in actuality it was just that no one wanted to contact them at all. Gee, I wonder why no one you met at the conference is inviting you out after. Could it be that they don't want to spend time with you? No, it must be that they're too stupid to understand how to contact you!

There were some fun business cards, and some cringe business cards, but nothing was a red flag the way a public key was. I have not used meshcore so maybe it's cool now, but I imagine not.