If you just want watermarks removed, use legitimate Telegram bots like @ttsavebot or websites like SavetheVideo. They do the same job without installing a backdoor on your Android device.
I ran the latest version (v3.2.4) through VirusTotal. 17 out of 62 antivirus engines flagged it as "Trojan.Generic" or "Riskware.AutoInjector." While false positives are common for modded apps, 17 is a high number.
I decided to dig into the APK, test its features (in a sandboxed environment), and weigh the pros and cons. Here is everything you need to know before hitting that "Download" button.