How to setup welcome messsage and captcha verification on Telegram - YouTube
Fight spam on your Telegram group with hCaptcha | Blog - hCaptcha
Utility bots - Bot for telegram
RottenSwap on Twitter: "Some users are reporting us a bot impersonating us on Telegram. THERE IS NO #AIRDROP BOT FOR $ROT ! Report him and stay safe !!! https://t.co/CwS3rhZoLQ" / Twitter
GitHub - halloall/Telegram-CAPTCHA-Bot: A bot running on Telegram which will send CAPTCHA to verify if the new member is a human.
Shieldy Telegram Bot
How to captcha verification in Telegram. || How to add captcha in telegram. - YouTube