Not only Telegram. Twitter is also full with bots. I interacted with a couple of posts regarding the ARB airdrop and for the next week I was getting tagged in scam tweets, promoting fake links. I've never reported so many posts in my life, sadly none of them were deleted.
Scammers use all kinds of social media to promote their fake websites. There are even some referral link promoters who promote various types of scam websites without doing any research in hopes of getting a commission.
Arbitrum airdrop is now the most hyped trending news, as a result of which scammers are using this news to create scam websites.