Telegram has not given any private data to any government. They have been banned (that didn't stop them tho) for this.
Whatsapp backsups are strongly encouraged by the app on a frequent basis. You cannot control the backup settings for your contacts. Therefore almost every group is backed up to google drive. Google has allegedly given this data to the authorities because these chats have leaked in a popular case here in India.
The unfortunate reality is that moving to Telegram is moving to a new Facebook. Yes, they offer a bunch of fancy features, unfortunately it's at the price of true privacy. All your data, for all perpetuity, will be stored on telegram servers where you hope that at no point in the future will they be compromised or forced to rat you out.
This is not a problem that Signal faces as they do not keep any of your data.
Whatsapp backsups are strongly encouraged by the app on a frequent basis. You cannot control the backup settings for your contacts. Therefore almost every group is backed up to google drive. Google has allegedly given this data to the authorities because these chats have leaked in a popular case here in India.
https://www.thenewsminute.com/article/how-ncb-retrieved-what...
https://www.indiatoday.in/technology/news/story/bollywood-wh...