There are two different versions of Telegram.app
☞ official Telegram
☞ Unofficial Telegram
official Telegram Created and supported by Telegram company (https://www.telegram.org). The last version is available on the Telegram website.in official Telegram app does not see advertisers and Making profits will never be an end-goal for official Telegram App
Unofficial Telegram
It is a modified version of the original Telegram with even more features. Some of the features like themes, more emoticons, chat screen customisations and much more. Telegram has given ability to the developers and programmers to create other versions of Telegram with new design and more services, including various themes, different languages and additional menus. Many people use unofficial versions of Telegram, but the point to keep in mind is unauthorized access to users 'information and programmers' identities.
Picture 2 : unofficial Telegram version
Telegram Unofficial versions are not secure, and the CEO of Telegram warned about this a year ago. There are many unofficial versions of Telegram. These versions have differences and advantages compared to each other, which increases the user's desire to install them. But, in addition to unauthorized access to user information, the unknown identity of developer of the program also raises doubts about the installation of programs. So it is better to always use the Telegram official version that published by the Telegram company and not to use the unofficial versions that designed by other programmers.
You may be wondering why some programmers, publish unofficial telegrams and charge a lot of money for install them by users. The answer is clear and simple, use your telegram for purposes such as accessing your information, subscribing to the groups and channels that the programmers of telegram unofficial version wants.