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That's just not true. If you give your kid WhatsApp access because that's how 95% of their peers text each other, then your kid has access to a hidden chat that can only be revealed by typing a secret code in the search bar. Tell me how a parent is supposed to parent their kid when they can do that? Locking down WhatsApp is no solution because then they can't talk to anyone. (Other countries do not use SMS as much as…
I don't have kids but I do wonder if maybe the downsides of WhatsApp etc outweigh the benefits? Lack of practice with face to face communication, near inability to talk on the phone, less quality connection with people in general, craned necks, myopia, hidden bullying, privacy violations, dependency on a US company etc And what do you mean by "can't talk to anyone"?
Giving a highschool kid a phone is basically mandatory or they will be cut off from activities, and/or rely on a friend to relay messages. In some places even middleschoolers need it.
There are definitely downsides (not to mention WhatsApp is a really badly engineering program), but the network effect is too strong to fight.