Gregory's Server@Brendanjones In that particular case, you can also use a regular text message.
Your point is still valid, though. No public systems should use private systems.
On the Dutch trains, the message should (at the very least) LEAD with text message, not Whatsapp.
@Brendanjones @VK6VCC if I’m sitting on a Dutch train and send a text message, I’m pretty sure there’s a private service or two involved.