

As mentioned in my post, there are tons of tools and derivative applications that can simply drop in any username/profile and access a full index of publicly available data about that profile/account: frequently used app and usage times, who blocked you, who did you block, your old username, etc… because PDS data is public. That is truly dangerous and concerning.
Do you understand the point? Read the comments again.
He left Whatsapp and created something similar. There’s no guarantee it’s more private, more secure, or won’t be sold again.