Technology has come so far.
The cynic in me immediately thinks this is so Facebook can further connect your activity to sell
Probably, I mean the reason most people pop a 2nd SIM in their phone is for registering on websites where they’d rather not have their main number cross-referenced and datamined. This can be anything from Amazon to personal ads sites.
But the moment you give in to the temptation to register than 2nd number with Whatsapp Meta will be able to figure out from your contacts who you are and associate it with the main number.
What a time to be alive
Great! So now I can not use a meta product twice! Switch to signal, element or simplex and dump surveillance companies forever guy!
And yes it has encryption, it’s still meta data open and the owner is meta! Enough said
Ah yes. Now meta will know the high profile business guy behind account A also browses kiddy porn via account B. Well played.