Idk, I feel like Telegram is viewed more like a subscription based twitter feed. It’s more about pushed updates to groups of people then communication between loved ones. (It’s also used a lot as a support medium, although I wouldn’t considered forced adoption for support or even notification as an indication of user adoption that’s like saying EV adoption is trending up while some areas almost force conversion).

I don't even get the idea of "moving" messengers.

Using several messengers is what enables competition between them in the first place. It's great for the ecosystem. All messages end up in my notification bar anyway, irrespective of the underlying app.

In my German peer group almost everyone is on Signal as well as WhatsApp. (... and Telegram, for that matter.)

Nobody "moved".

Not happening here in the Uk - the world over here is still on WhatsApp.

It's definitely happening in some circles. I was quite surprised to hear that my dad's reasonably active sibling chat group uses Signal, and we're talking about a dozen+ mostly technologically-inept people aged 40-70.

To give an example of how inept, my dad recently discovered that iOS Safari has tabs, and he's had a smartphone for close to a decade and uses Safari heavily. I have no idea what prompted them to switch away from WhatsApp, and before that, GroupMe (which they used for a while because it worked through SMS), but they did.