It is very strange and suspicious that messengers can cover almost all Android devices.
However, some other applications (For example, applications related to cryptocurrencies) that are not very complex can not cover all devices.
Telegram: Version 7.8.0 (23605) Added on 2021-07-05 This version requires Android 4.1 or newer.
WhatsApp Messenger: (from play store) Updated 6 July 2021 Current Version 184.108.40.206 Requires Android 4.1 and up
Termux: Version 0.116 (116) Added on 2021-07-07 This version requires Android 7.0 or newer.
BlueWallet: Version 6.1.6 (60106) Added on 2021-07-05 This version requires Android 9.0 or newer.
Exodus: Crypto Bitcoin Wallet (From play store) Updated 3 July 2021Current Version 21.7.2 Requires Android 8.0 and up.
Q1: How can Android 4.1 be secure for messengers but not for other apps?
Q2: If Android 4.1 is not secure, So why use it for messengers!?