Very belated edit: That comes across as a bit heartless. I mean, we have no clue who each other are in meatspace. So why is a potential identity change so problematic?
It's just the TFA example:
> Bob (Eve): Hey Hey
> Alice: Yo Bob! Looks like you got new safety numbers.
> Bob (Eve): Yeah, I got the iPhone XS, nice phone, I'm really happy with it. Let's exchange safety numbers at RWC 2020. Hey - do you have Caroline's current address? Gonna surprise her while I'm in SF.
Now, I and my iffy correspondent have never shared anything actionable about third parties. But I do know a little about what he's doing, and have offered advice. And it would be very hard to continue doing that, without the risk of revealing potentially damaging information.
It's just the TFA example:
> Bob (Eve): Hey Hey
> Alice: Yo Bob! Looks like you got new safety numbers.
> Bob (Eve): Yeah, I got the iPhone XS, nice phone, I'm really happy with it. Let's exchange safety numbers at RWC 2020. Hey - do you have Caroline's current address? Gonna surprise her while I'm in SF.
> Alice: Bad call, Android 4 life! Yeah 555 Cozy Street.
Now, I and my iffy correspondent have never shared anything actionable about third parties. But I do know a little about what he's doing, and have offered advice. And it would be very hard to continue doing that, without the risk of revealing potentially damaging information.