Not sure anybody ever used those. At -like- chf 1 a pop, they paved the way for WhatsApp to eat mobile telecom's lunch.
Recent deals from Yallo mention throttling when roaming, but not in Switzerland where unlimited is really unlimited.
I have sunrise unlimited internet for 5 CHF/month (10 CHF without discount). Includes like 500 MB for roaming per month as well.
The formatting is messed up for me, so here's an third party alternative:
https://drfone.wondershare.com/whatsapp/how-to-stop-auto-dow...
I guess it does explain why people use apps like Telegram and WhatsApp while their usage is close to non-existent here.