I don't know if they're simply innocent newbies or something else is really wrong with them, but very basic reminders never get old; they remain relevant all the time.
Days ago, there was a thread here about a hardware wallet that's compromised. The reason is that the seed was stored in a cloud. The purpose of the hardware wallet, which was to store the seed offline, was defeated right way when the backup was stored online.
Days ago also, there was a topic on reddit about somebody who was scammed while ordering metal seed backup. The reason is that he shared the seed for engraving. The purpose of having a seed backup in metal is to make sure it's protected from all kind of elements while kept hidden, so that it will last. Everything became pointless the moment it was shared with somebody else.
https://www.reddit.com/r/Bitcoin/comments/1i3glsw/beware_bitcoin_seed_phrase_scams/This isn't a sophisticated scam. It's so obvious that it's both mind-boggling and funny when somebody falls for it. But people fall for it, newbies especially. But considering that they're already into self-custody and metal backups, they're supposed to be more advanced. Or perhaps they're too eager going to the next level even if they aren't ready yet.
By the way, this happened on Etsy. The victim ordered from spacemuletrading.